Item Description
Resting on a solid bed of white quartz crystal, this enormous and dazzling cluster of Amethyst is perfect for all types of showcasing and decor. Weighing a hefty 5.4 lbs (2.45 kg), this crystal specimen measures 8.5" in length, 3.25" in width, and 2.85" in height. The dark green and course texture of the root suggests the crystal was forming atop a matrix of malachite.
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
