Amethyst Amethyst cluster from Maga

Amethyst

Amethyst cluster from Magaliesburg, South Africa.

General
Category Quartz
Formula
(repeating unit) Silica (silicon dioxide, SiO2)

Identification
Color Purple, violet
Crystal habit
6-sided prism ending in 6-sided pyramid (typical)
Crystal system
rhombohedral class 32

Twinning
Dauphine law, Brazil law, and Japan law
Cleavage
None
Fracture
Conchoidal
Mohs scalehardness
7–lower in impure varieties
Luster
Vitreous/glossy
Streak
White
Diaphaneity
Transparent to translucent
Specific gravity
2.65 constant; variable in impure varieties
Optical properties Uniaxial (+)
Refractive index
nω = 1.543–1.553
nε = 1.552–1.554
Birefringence
+0.009 (B-G interval)
Pleochroism
None
Melting point
1650±75 °C
Solubility
insoluble in common solvents
Other characteristics Piezoelectric

ผลลัพธ์ (อังกฤษ) 2:

Amethyst Amethyst Cluster from Magaliesburg, South Africa. General Category Quartz Formula (repeating UNIT) Silica (Silicon dioxide, SiO2) Identification Color Purple, violet Crystal habit 6-sided prism Ending in 6-sided Pyramid (Typical) Crystal System rhombohedral Class 32 Twinning. Dauphine Law, Law Brazil, and Japan Law Cleavage None Fracture conchoidal Mohs Scalehardness 7-Impure Varieties in Lower Luster Vitreous / Glossy Streak White Diaphaneity Transparent to Translucent Specific Gravity 2.65 Constant; Impure Varieties in Variable Optical properties uniaxial (+) Refractive index from 1.543 to 1.553 Nω = Nε = 1.552 to 1.554 birefringence +0.009 (BG interval) Pleochroism None Melting Point 75 ° C ± one thousand six hundred and fifty Solubility insoluble in common solvents Other characteristics Piezoelectric.

ผลลัพธ์ (อังกฤษ) 3:

Amethyst

Amethyst cluster, from Magaliesburg South Africa.


, General Category Quartz
Formula
(repeating unit) Silica (silicon, dioxide SiO2)



, Identification Color Purple violet Crystal habit
6-sided. Prism ending in 6-sided pyramid (typical)
Crystal system



rhombohedral class 32 Twinning Dauphine law Brazil law and Japan,,, Law



Cleavage None Fracture Mohs scalehardness Conchoidal

.7 - lower in impure varieties

Luster Vitreous / glossy



Streak White Diaphaneity Transparent to translucent

Specific gravity 2.65. Constant; variable in impure varieties
Optical properties Uniaxial (a)

= 1.543 Refractive index n conductivity - 1.553
n ε = 1.552 - 1.554

0.009 Birefringence (B-G. Interval)



Pleochroism None Melting point 1650 edge 75 ° C

insoluble Solubility in common solvents
.Other characteristics Piezoelectric
.