ACTINOLITE

ADAMITE

ADULARIA

ALLANITE

             Crystal system : Monoclinic
Chemical composition : Calcium magnesium iron silicate
Color : Green
Hardness : 5.0 - 6.0
Specific gravity : 3.0 - 3.3
Refractive index : 1.61
Dispersion : weak
Pleochroism : N/A

Crystal system : Orthorhombic
Chemical composition : Zn2 AsO4 (OH)
Color : Light yellow, honey-yellow, brownish yellow, pale green, yellowish green, rarely colourless
Hardness : 3.5
Specific gravity : 4.4
Refractive index : 1.743

Crystal system :
Chemical composition :
Color :
Hardness :
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Crystal system : Monoclinic
Chemical composition : Calcium Cerium Lanthanum Yttrium Aluminum Iron Silicate Hydroxide
Color : Black, brown, brownish violet
Hardness : 5.5
Specific gravity : 3.0 - 4.2
Refractive index : N/A
Dispersion : N/A
Pleochroism : N/A

AMAZONITE

AMBER

AMBLYGONITE

AMETHYST

Crystal system : Triclinic
Chemical composition : Aluminum Potassium Silicate
Color : Green, green-blue, blue-green
Hardness : 6.0 - 6.5
Specific gravity : 2.56 - 2.58
Refractive index : 1.52 - 1.53
Dispersion : 0.012

Crystal system : Amorphous
Chemical composition : Oxygenated Hydrocarbon
Color : Yellow, red, orange
Hardness : 2.0 - 2.5
Specific gravity : 1.096
Refractive index : 1.54
Dispersion : N/A

Crystal system : Triclinic
Chemical composition : Lithium aluminum fluophosphate
Color : Yellow, greenish, colorless.
Hardness : 5.5 to 6.0
Specific gravity : 3.0
Refractive index : 1.61 – 1.64 (0.024) B(±)
Dispersion : Weak
Pleochroism : None

Crystal system : Trigonal
Chemical composition : SiO2
Color : Violet, purple pink.
Hardness : 7.0
Specific gravity : 2,65
Refractive index : 1.54
Dispersion : 0,013
Pleochroism : None
Birthstone : February

AMETRINE

ANATASE

ANDALUSITE

ANGLESITE

Crystal system : Trigonal
Chemical composition : SiO2
Color : Violet / Yellow
Hardness : 7.0
Specific gravity : 2,65
Refractive index : 1.54
Dispersion : 0,013

Crystal system : Tetragonal
Chemical composition :Titanium Oxide
Color : Brown to black, yellow and blue
Hardness : 5.5 - 6.0
Specific gravity: 3.8 - 3.9
Refractive index :
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Crystal system : Orthorhombic
Chemical composition : Aluminum silicate
Color : Green, pink, brownish, red
Hardness : 6.5 - 7.5
Specific gravity : 3.1
Refractive index : 1.64
Dispersion : 0.016
Pleochroism : Red, yellow and green (trichroism)

Crystal system : Orthorhombic
Chemical composition : Lead sulphate
Color : Colorless, yellow, green
Hardness : 2.5 to 3
Specific gravity : 6.3 (very heavy !)
Refractive index : 1.88 – 1.89 (0.017) B(+)
Dispersion : 0.044 (high)
Pleochroism : None

ANHYDRITE

APATITE

APATITE CAT'S EYE

APATITE COL. CHANGE

Crystal system : Orthorhombic
Chemical composition : Calcium sulphate
Color : Colorless, purple
Hardness : 3.0 - 3.5
Specific gravity : 2.9
Refractive index : 1.57
Dispersion : 0.013
Pleochroism : N/A

Crystal system : Hexagonal
Chemical composition : Calcium fluo-phosphate
Color : Blue, green, pink, yellow, violet, colorless
Hardness : 5.0
Specific gravity : 3.17 - 3.23
Refractive index : 1.632 - 1.646
Dispersion : 0.016
Pleochroism : Blue-yellow / blue-colorless

Crystal system : Hexagonal
Chemical composition : Calcium fluo-phosphate
Color : Blue, green, pink, yellow, violet, colorless
Hardness : 5.0
Specific gravity : 3.17 - 3.23
Refractive index : 1.632 - 1.646
Dispersion : 0.016
Pleochroism : Blue-yellow / blue-colorless

Crystal system : Hexagonal
Chemical composition : Calcium fluo-phosphate
Color : Blue, green, pink, yellow, violet, colorless
Hardness : 5.0
Specific gravity : 3.17 - 3.23
Refractive index : 1.632 - 1.646
Dispersion : 0.016
Pleochroism : Blue-yellow / blue-colorless

APATITE NEON

APOPHYLLITE

AQUAMARINE

ARAGONITE

Crystal system : Hexagonal
Chemical composition : Calcium fluo-phosphate
Color : Blue, green, pink, yellow, violet, colorless
Hardness : 5.0
Specific gravity : 3.17 - 3.23
Refractive index : 1.632 - 1.646
Dispersion : 0.016
Pleochroism : Blue-yellow / blue-colorless

Crystal system : Tetragonal
Chemical composition : Potassium fluo-calcium silicate
Color : Colorless, Pink, Green
Hardness : 4.5 - 5.0
Specific gravity : 2.4
Refractive index : 1.53
Dispersion :N/A
Pleochroism : None

Crystal system : Hexagonal
Chemical composition : Silicate of aluminium beryllium Al2 Be3 (Si6 O18)
Color : Blue to blue-green
Hardness : 7.5 - 8.0
Specific gravity : 2,72 (+0,18 -0,05)
Refractive index : 1,577 - 1,583
Dispersion : 0,014
Pleochroism : Light to medium (blue, sometimes blue and blue-green)
Birthstone : March

Crystal system : Orthorhombic
Chemical composition : Potassium fluo-calcium silicate
Color : Colorless, pink, greenish
Hardness : 4.0 - 5.0
Specific gravity : 2.4
Refractive index : 1.53
Dispersion : N/A
Pleochroism : N/A

AUGELITE

AXINITE

AZURITE

Crystal system : Monoclinic
Chemical composition : Al2(PO4)(OH)3
Color : White, colourless, yellow, blue or pink
Hardness : 4.5 - 5.0
Specific gravity : 2.696
Refractive index : 1.576

Crystal system : Triclinic
Chemical composition : Calcium aluminum boro-silicate
Color : Brown, grey, blue, violet, greenish, yellow, red
Hardness : 6.5 - 7.0
Specific gravity : 3.3
Refractive index : 1.68
Dispersion :N/A
Pleochroism : Colorless to brown

Crystal system : Monoclinic
Chemical composition : Basic Copper Carbonate
Color : Deep Blue
Hardness : 3.5 - 4.0
Specific gravity : 3.8
Refractive index : 1.73 - 1.83
Dispersion : N/A

BAHIANITE

BARITE

BASTAINITE

BERYLLONITE

Crystal system :
Chemical composition :
Color :
Hardness :
Specific gravity :
Refractive index :
Dispersion :
Pleochroism :

Crystal system : Orthorhombic
Chemical composition : Barium sulfate
Color : Colorless, yellow, brown, blue
Hardness : 3 to 3.5
Specific gravity : 4.3 to 4.6
Refractive index : 1.636 – 1.648 (0.012) B(+)
Dispersion : Weak
Pleochroism : Weak

Crystal system :
Chemical composition :
Color :
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Crystal system : Orthorhombic
Chemical composition : Sodium beryllium phosphate
Color : Colorless to light yellow
Hardness : 5.5 - 6.0
Specific gravity : 2.8
Refractive index : 1.55
Dispersion :0.010

BOLEITE

BORACITE

BRAZILIANITE

BURBANKITE

Crystal system : Tetragonal
Chemical composition : Hydrated Lead Copper Silver Chloride Hydroxide
Color : Deep blue (almost black) to a lighter indigo blue
Hardness : 3.0 - 3.5
Specific gravity : 5.0 +
Refractive index : 2.03
Dispersion : Weak

Crystal system : Orthorhombic
Chemical composition : Magnesium Borate Chloride
Color : White, colorless, pale yellow, green and blue
Hardness : 7.0 - 7.5
Specific gravity : 2.9 - 3.0
Refractive index : 1.66
Dispersion : 0.011

Crystal system : Monoclinic
Chemical composition : Hydrous sodium aluminum phosphate
Color : Colorless, light yellow, yellow-green.
Hardness : 5.5
Specific gravity : 2.98 to 3.0
Refractive index : 1.602 – 1.621 (0.02) B(+)
Dispersion : 0.014
Pleochroism : Weak

Crystal system : Hexagonal
Chemical composition : Sodium Calcium Strontium Barium Carbonates
Color : Yellow, pale orange, colorless
Hardness : 3.5 - 4.0
Specific gravity : 3.5
Refractive index : 1.61
Dispersion : N/A
Pleochroism : N/A

BUSTAMITE

BUSTAMITE (CAB)

BYTOWNITE

Crystal system : Triclinic
Chemical composition : Calcium manganese silicate
Color : Pinkish Red
Hardness : 5.5 - 6.5
Specific gravity : 3.3 - 3.4
Refractive index : 1.67
Dispersion : Weak
Pleochroism : N/A

Crystal system : Triclinic
Chemical composition : Calcium manganese silicate
Color : Pinkish Red
Hardness : 5.5 - 6.5
Specific gravity : 3.3 - 3.4
Refractive index : 1.67
Dispersion : Weak
Pleochroism : N/A

Crystal system : Triclinic
Chemical components : (Ca,Na) (Si,Al)4O8
Color : Pale shades of every colors
Hardness : 6.0 - 6.5
Specific gravity : 2.72 - 2.74
Refractive index : 1.54 - 1.58
Dispersion : N/A
Pleochroism : N/A

CALCITE

CANCRINITE

CARLETONITE

CASSITERITE

Crystal system : Hexagonal
Chemical composition : Calcium carbonate
Color : Colorless, yellow, orange, red, brown
Hardness : 3.0
Specific gravity : 2.7
Refractive index : 1.48 and 1.65
Dispersion : .008 and .017
Pleochroism : N/A

Crystal system : Hexagonal
Chemical composition : Sodium Calcium Aluminum Silicate Carbonate
Color : Colorless, white, yellow, orange, pink, or blue
Hardness : 5.0 - 6.0
Specific gravity : 2.4 - 2.5
Refractive index : N/A
Dispersion : N/A

Crystal system : Tetragonal
Chemical composition : Hydrated Potassium Sodium Calcium Carbonate Silicate Fluoride Hydroxide
Color : blue, white, colorless or pink
Hardness : 4.5 - 5.0
Specific gravity : 2.45

Crystal system : Tetragonal
Chemical composition : Tin Oxide
Color : Black, reddish brown, yellow
Hardness : 6.0 - 7.0
Specific gravity : 6.6 - 7.0
Refractive index : 1.99 - 2.09
Dispersion : 0.071

CATAPLEIITE

CERUSSITE

CHALCEDONY

     CHALCEDONY (CAB)

Crystal system : Monoclinic
Chemical composition : Sodium zirconium silicate hydrate
Color : Colorless to gray, pale yellow, yellowish-brown, reddish
Hardness : 5.0 to 6.0
Specific gravity : 2.8
Refractive index : 1.59 – 1.63 (0.036) B(+)
Dispersion : Moderate
Pleochroism : None

Crystal system : Orthorhombic
Chemical composition : PbCO3 (Lead Carbonate)
Color : Colorless, gray, yellow, blue-green.
Hardness : 3.0 - 3.5
Specific gravity : 6.5
Refractive index : 2.07
Dispersion : N/A
Pleochroism : N/A

Crystal system : Triclinic
Chemical composition : Silicium Dioxide
Color : Blue, greenish blue, grayish blue
Hardness : 6.5
Specific gravity : 2.61
Refractive index : 1.53

Crystal system : Triclinic
Chemical composition : Silicium Dioxide
Color : Blue, greenish blue, grayish blue
Hardness : 6.5
Specific gravity : 2.61
Refractive index : 1.53

CHAROITE

CHONDRODITE

CHROME TOURMALINE

CHROMOVE SUVIANITE

Crystal system : Monoclinic
Chemical composition : (Ca,K,Na)Si4O10(OH,F)H2O
Color : Mauvish + White
Hardness : 5.0 - 6.0
Specific gravity : 2.56
Refractive index : 1.553

Crystal system : Monoclinic
Chemical composition : (MgFe)5 (SiO4)2 (F, OH)2
Color : Yellow, red or brown
Hardness : 6.0 - 6.5
Specific gravity : 3.15
Refractive index : 1.629

Crystal system : Trigonal
Chemical composition : Borosilicate complex
Color : Green
Hardness : 7.0 - 7.5
Specific gravity : 3.06
Refractive index : 1.62 - 1.64
Dispersion : 0.017
Birthstone : October

Crystal system : Tetragonal
Chemical composition : Chromium aluminum silicate
Color : Emerald green
Hardness : 6.0 - 7.0
Specific gravity : 3.3 - 3.4
Refractive index : 1.71
Dispersion : 0.019
Pleochroism : N/A

CHROMOVE- SUVIANITE CAB

CHRYSOBERYL

   CHRYSOBERYL   CAT'S EYE

CHRYSOCOLLA

Crystal system : Tetragonal
Chemical composition : Chromium aluminum silicate
Color : Emerald green
Hardness : 6.0 - 7.0
Specific gravity : 3.3 - 3.4
Refractive index : 1.71
Dispersion : 0.019
Pleochroism : N/A

Crystal system : Orthorhombic
Chemical composition : Al2(BeO4)
Color : Yellow, greenish yellow
Hardness : 8.5
Specific gravity : 3.70
Refractive index : 1.74 - 1.75
Dispersion : 0.015
Pleochroism : Reddish yellow, greenish yellow, green.

Crystal system : Orthorhombic
Chemical composition : Al2(BeO4)
Color : Yellow, greenish yellow
Hardness : 8.5
Specific gravity : 3.70
Refractive index : 1.74 - 1.75
Dispersion : 0.015
Pleochroism : Reddish yellow, greenish yellow, green.

Crystal system : N/A
Chemical composition : CuSiO3 2H2O
Color : Green, Bluish
Hardness : 2.0 - 4.0
Specific gravity : 2.00 - 2.40
Refractive index : 1.50

CHRYSOCOLLA TRANSL.

CITRINE (FANCY)

CITRINE (LEMON)

CLINOHUMITE

Crystal system : N/A
Chemical composition : CuSiO3 2H2O
Color : Green, Bluish
Hardness : 2.0 - 4.0
Specific gravity : 2.00 - 2.40
Refractive index : 1.50

Crystal system : Trigonal
Chemical composition : Silicon dioxyde (SiO2).
Color : Yellowish orange to brownish yellow.
Hardness : 7.0
Specific gravity : 2,65
Refractive index : 1,54-1.55
Dispersion : 0,013
Pleochroism : Yellow to light yellow.
Birthstone : November (alternate stone).

Crystal system : Trigonal
Chemical composition : Silicon dioxyde (SiO2).
Color : Yellowish orange to brownish yellow.
Hardness : 7.0
Specific gravity : 2,65
Refractive index : 1,54-1.55
Dispersion : 0,013
Pleochroism : Yellow to light yellow.
Birthstone : November (alternate stone).

Crystal system : Orthorhombic
Chemical composition : Al2(BeO4)
Color : Yellow, greenish yellow
Hardness : 6.0
Specific gravity : 2.7
Refractive index : 1.74 - 1.75
Dispersion : 0.015
Pleochroism : Orangish yellow.

  CORDIERITE (CAB)

Crystal system :
Chemical composition :
Color :
Hardness :
Specific gravity :
Refractive index :
Dispersion :
Pleochroism :

Crystal system : Orthorhombic
Chemical composition : (MgFe)2 Al4 Si5 )18 Silicate of aluminium and magnesium
Color : Violet blue.
Hardness : 7.0 - 7.5
Specific gravity : 2.54 - 2.66
Refractive index : 1.53 - 1.55
Dispersion : 0,017
Pleochroïsm : Colorless/yellow ; blue/strong blue/violet.

  Crystal system : Orthorhombic
Chemical composition : (MgFe)2 Al4 Si5 )18 Silicate of aluminium and magnesium
Color : Violet blue.   
Hardness : 7.0 - 7.5 
Specific gravity : 2.54 - 2.66 
Refractive index : 1.53 - 1.55
Dispersion : 0,017 
Pleochroism : Colorless/yellow; blue/strong blue/violet.

DANBURITE

DATOLITE

DEMANTOID

DIOPSIDE

Crystal system : Orthorhombic
Chemical composition : Calcium borosilicate
Color : Colorless, light pink, yellow, orange, brown.
Hardness : 7.0
Specific gravity : 3.0
Refractive index : 1.630 – 1.636 (0.006) B(-)
Dispersion : 0.017
Pleochroism : Usually none

Crystal system : Monoclinic
Chemical composition : Calcium borosilicate
Color : Colorless, yellow, greenish, reddish
Hardness : 5.0 - 5.5
Specific gravity : 2.8 - 3.0
Refractive index : 1.65
Dispersion : 0.016
Pleochroism : None

Crystal system : Isometric
Chemical composition : Ca3Fe2Si3 O12.
Color : Various shades of green.
Hardness : 6.5 - 7.0
Specific gravity : 6.5
Refractive index : 1.89
Dispersion : N/A
Pleochroism : N/A

Crystal system : Monoclinic
Chemical composition : CaMg(SiO3)2
Color : Green, yellow, colorless.
Hardness : 5.0 - 6.0
Specific gravity : 3.30
Refractive index : 1.67 - 1.72
Dispersion : None
Pleochroism : green-yellow, green-olive