Quartz (Massive)
Silicon Dioxide (Quartz) · Mineral Specimen / Common Rock Constituent
Crystal System
Trigonal; massive and microcrystalline habit often found in rock matrices
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal or Igneous; typically forms from silica-rich fluids in veins or as a component of igneous rocks
About This Crystal
An opaque to translucent greyish-white mineral embedded in a larger rocky matrix. It exhibits a dull to vitreous luster on fresh surfaces with an irregular, somewhat granular texture.
Physical Characteristics
Color: Grey/White; Streak: White; Fracture: Conchoidal to uneven; Specific Gravity: 2.65; No fluorescence typically observed in common varieties.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Uniaxial (+); typically lacks light phenomena in massive form.
Hardness & Durability
Origin Region
Worldwide; globally ubiquitous in continental crust and sedimentary environments
Hardness & Durability
Mohs Hardness: 7; Highly durable and resistant to chemical weathering, though brittle under impact.
Care & Maintenance
Wash with warm soapy water; resistant to most household chemicals except hydrofluoric acid; safe for outdoor display.
Rarity & Value
Very Common; low monetary value unless occurring as high-clarity large crystals or with specific inclusions.
Special Characteristics
Piezoelectric and pyroelectric properties; this specimen shows typical massive growth without distinct crystal faces.
Lore & History
Quartz has been used since prehistory for tools (chipped stone) and ornamentation. In various cultures, it is regarded as a 'master healer' stone, symbolizing clarity and energy amplification.