Sandstone or Weathered Silicate Fragment
Quartz Sandstone · Mineral Specimen
Crystal System
Trigonal
Mineral Group
Silicates
Chemical Formula
SiO2
Formation Process
Sedimentary
About This Crystal
An opaque, brownish-gray, weathered fragment of sedimentary rock with a dull, earthy luster and a granular, rough surface texture.
Physical Characteristics
Brownish-gray color, white streak, no distinct cleavage, uneven to splintery fracture, specific gravity around 2.65, brittle tenacity.
Optical Properties
Singly or doubly refractive depending on quartz grain orientation, no notable pleochroism or special optical phenomena.
Hardness & Durability
Origin Region
Worldwide
Hardness & Durability
Mohs hardness of 6 to 7 for individual quartz grains, though the rock aggregate durability depends on cementing material.
Care & Maintenance
Wash with mild soapy water, store away from impacts, no extreme chemical sensitivities.
Rarity & Value
Very common, little to no commercial gemstone value.
Special Characteristics
None notable.
Lore & History
Used traditionally for grounding and connection to the Earth element, though these are cultural and metaphysical beliefs only.