Item Description
This months we're raffling off this large amethyst geode with blue agate and goethite. Multiple entries are allowed. Winners will be announced and contacted at the beginning of March. Please make sure to register an account with an email or phone number which we can reach you at. Non-local contestants will receive free shipping via USPS. Good luck!
Amethyst
Stone of Sobriety
Properties of Amethyst
Physical Properties
Category:
Silicate Mineral
Crystal Class:
Trapezohedral
Crystal System:
Trigonal
Dana Classification:
75.01.03.01
Empirical Formula:
SiO2
Name:
Amethyst
Space Group:
P3221 (no. 154)
Strunz Classification:
04.DA.05
Synonym:
Stone of Sobriety
Mineral Identification
Birefringence: +0.009 (B-G interval)
Cleavage: None
Common Colors: Purple, Violet, Dark Purple
Crystal Habit: Crystalline, Druse, 6-Sided Prism, 6-Sided Pyramidal Termination
Diaphaneity: Transparent, Translucent
Formula Mass: 60.08 gm
Fracture: Conchoidal
Luster: Vitreous, Glassy
Mohs Hardness: 7
Optical Properties: Uniaxial (+), w=1.543-1.545, e=1.552-1.554, bire=0.0090.
Pleochroism: Weak to moderate Purple or Violet
Refractive Index: nω = 1.543–1.553, nε = 1.552–1.554
Streak: White
