trigonal Synthetic synthetic quartz
Hydrothermal Quartz (Crystal)
Formula SiO2
Crystal Structure
#! Species: Hydrothermal Quartz
#! System: Trigonal (32)
#! Habit: Prismatic crystal from hydrothermal growth
trigonal[32]:{10-10}@1.0 + {10-11}@0.8 + {01-11}@0.6
trigonal
32
{10-10} {10-11} {01-11}
Quick Facts
Hardness
7.0
Specific Gravity
2.65
Refractive Index
1.544
Optical Character
Uniaxial +
Physical Properties
- Crystal System
- trigonal
- Hardness (Mohs)
- 7.0
- Specific Gravity
- 2.65
- Cleavage
- None
- Fracture
- Conchoidal
- Lustre
- Vitreous
Optical Properties
- Refractive Index
- 1.544
- Birefringence
- 0.009
- Optical Character
- Uniaxial +
- Dispersion
- 0.013
- Fluorescence
- Inert
Origin & Identification
- Origin
- Synthetic
- Growth Method
- Hydrothermal
- First Produced
- 1950
- Diagnostic Features
- Breadcrumb-like inclusions along seed plate, extremely clean, seed plate visible, absence of natural inclusions (e.g., no liquid-gas inclusions, no acicular rutile), twinning follows seed
Characteristics
Colours
ColourlessAmethystCitrineSmokyAmetrine
Common Inclusions
Seed plateBreadcrumb inclusionsTwo-phase inclusions along seed
Natural Counterpart
The natural gem this synthetic imitates
Related Minerals
Other minerals in the trigonal system
