Druzy Quartz on Matrix
Silicon Dioxide var. Druzy Quartz · Mineral Specimen / Decorative Stone
Crystal System
Trigonal; massive/granular matrix with micro-crystalline druzy habit on surface
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Trace amounts of Fe may provide brownish color)
Formation Process
Hydrothermal; formed when silica-rich water fills cavities in rock (geodes or veins) and precipitates tiny crystals
About This Crystal
An opaque, earthy brown-to-gray matrix covered in a layer of tiny, sparkling quartz crystals. The druse exhibits a vitreous luster that creates a sugar-like glittering effect across the surface.
Physical Characteristics
Color: Brown/Tan matrix with colorless crystals; Streak: White; Fracture: Conchoidal (crystals) to uneven (matrix); Specific Gravity: ~2.65; Fluorescence: Usually inert/none.
Optical Properties
Vitreous luster from micro-facets; individual crystals are doubly refractive but too small to measure without specialized equipment.
Hardness & Durability
Origin Region
Global occurrences; notably Brazil, Uruguay, and USA in sedimentary or volcanic environments
Hardness & Durability
Mohs 7 for the quartz crystals; the matrix rock may range from 5-6. Generally durable but the druse layer can be brittle if struck.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners which may loosen the druzy layer; store away from harder gems to prevent scratching.
Rarity & Value
Common; value depends on the sparkle, uniformity of the druse, and the aesthetics of the matrix. Generally affordable as a collector specimen.
Special Characteristics
Druse (clusters of tiny crystals covering a surface); sparkling reflection of light from numerous crystal faces.
Lore & History
Historically used as decorative accents. In traditional lore, quartz is associated with clarity and amplification; druzy forms are often symbolically linked to group harmony and social joy.