Clear Quartz
Quartz · Mineral Specimen / Semi-Precious Gemstone
Crystal System
Trigonal; typically prismatic with pyramidal terminations, though appearing massive or as irregular grains in this matrix environment.
Mineral Group
Silicates; Tectosilicate subgroup.
Chemical Formula
SiO2
Formation Process
Primarily Hydrothermal, forming from silica-rich fluids in veins or cavities within Igneous or Metamorphic rocks.
About This Crystal
Transparent to translucent colorless crystals embedded in a dark, earthy host rock. Visible vitreous luster and irregular fracture patterns on exposed surfaces.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009 (Uniaxial positive); No pleochroism due to lack of pigment.
Hardness & Durability
Origin Region
Found globally; notable sources include Brazil, Arkansas (USA), and Madagascar. This specimen appears to be in an in-situ rocky matrix.
Hardness & Durability
Mohs Hardness: 7; Very durable; Toughness is good though it can chip along conchoidal fracture lines; stable against chemicals except hydrofluoric acid.
Care & Maintenance
Safe to clean with warm soapy water and soft brushes. Avoid sudden thermal shock despite high stability.
Rarity & Value
Very Common; Value for raw specimens is low, priced by weight or aesthetic 'druzy' coverage; specialized inclusions can increase value.
Special Characteristics
Piezoelectric and pyroelectric properties; this specimen shows standard glassy luster without visible inclusions like rutiles or phantoms.
Lore & History
Historically known as 'Rock Crystal'; used since antiquity for carvings and tools. In traditional lore, it is considered a 'Master Healer' associated with the Crown Chakra.