Quartz (Microcrystalline variety)
Silicon Dioxide (IMA-approved Quartz) · Mineral Specimen / Decorative Stone
Crystal System
Trigonal symmetry; displays a massive, microcrystalline, and drusy habit in pockets.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 with trace iron oxides (hematite/limonite)
Formation Process
Hydrothermal crystallization from silica-rich fluids at low temperatures in rock cavities or fractures.
About This Crystal
The specimen features a mix of translucent white to grey quartz with reddish-brown staining from iron oxide. It has a vitreous to earthy luster and shows a crumbly, druzy texture in recessed areas.
Physical Characteristics
Color: White, grey, reddish-brown. Streak: White. Cleavage: None. Fracture: Conchoidal to uneven. Specific Gravity: 2.65. Tenacity: Brittle. Non-magnetic. Variable fluorescence.
Optical Properties
Refractive Index: 1.544-1.553. Uniaxial positive. No significant pleochroism or chatoyancy visible in this rough form.
Hardness & Durability
Origin Region
Global occurrence; common in Brazil, Morocco, and the USA. Forms in hydrothermal veins and volcanic cavities.
Hardness & Durability
Mohs hardness of 7. Highly durable and stable against most chemicals and sunlight, though iron staining can be removed by acids.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes. Avoid hydrofluoric acid. Stable in sunlight and heat.
Rarity & Value
Very common. Value is low ($2-$10 for small rough specimens); primarily valued as a landscape or beginner mineral specimen.
Special Characteristics
Displays micro-druzy crystal lining in small vugs and iron-oxide staining that provides a variegated color pattern.
Lore & History
Quartz is historically one of the most used minerals for tools and talismans. In lore, it is considered a universal healing stone and amplifier of energy.