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Dominant species
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Amethyst
Chemical
Formula
SiO2
Species
Silicates
Mohs
Scale
7
Specific
Gravity
2.65
Color
Purple, Purple
Streak
White
Luster
Vitreous
Refractive
Index
nω = 1.543–1.553 nε = 1.552–1.554
Diaphaneity
Transparent to translucent
Cleavage
None
Fracture
Conchoidal
Crystal Habit:6-sided prism ending in 6-sided pyramid (typical)
Amethyst3516
Amethyst3516
Amethyst3514
Amethyst3514
Amethyst3511
Amethyst3511
Amethyst3505
Amethyst3505
Amethyst3499
Amethyst3499
Amethyst3492
Amethyst3492
Amethyst3491
Amethyst3491
Amethyst3487
Amethyst3487
Amethyst3484
Amethyst3484
Amethyst3482
Amethyst3482
Amethyst3480
Amethyst3480
Amethyst3478
Amethyst3478
Amethyst3477
Amethyst3477
Amethyst3473
Amethyst3473
Amethyst3469
Amethyst3469
Amethyst3468
Amethyst3468
Amethyst3465
Amethyst3465