Sandstone (Quartzite Pebble)
Sedimentary Sandstone (Quartz-rich) · Sedimentary Rock / Mineral Specimen
Crystal System
Trigonal (individual quartz grains); habit is massive, granular, and water-worn (clastic)
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Primary) with variable Al2Si2O5(OH)4 (clay) and Fe2O3 (iron oxides)
Formation Process
Sedimentary; formed via the weathering of pre-existing rocks, transport by water or wind, and subsequent lithification (cementation) under low pressure.
About This Crystal
A rounded, water-worn stone showing a grainy, clastic texture. The color is a neutral tan to light grey with a dull, earthy luster. It is opaque with a matte surface resulting from abrasive wear.
Physical Characteristics
Color: Tan/Beige; Streak: White; Cleavage: None; Fracture: Granular/Uneven; Specific Gravity: 2.63-2.65; Fluorescence: Generally none.
Optical Properties
Opaque; non-pleochroic; individual quartz grains are doubly refractive but invisible to the naked eye in this massive form.
Hardness & Durability
Origin Region
Global distribution; commonly found in riverbeds, glacial tills, and coastal regions worldwide.
Hardness & Durability
Mohs Hardness: 6 to 7 (depending on cementation); high toughness due to lack of cleavage; high stability against household chemicals.
Care & Maintenance
Extremely durable; can be cleaned with warm soapy water and a soft brush. Resistant to sunlight and most environmental factors.
Rarity & Value
Very Common; low monetary value as a single specimen; valued primarily for landscaping or industrial construction materials.
Special Characteristics
Pores between grains may permit water absorption; shows classic 'river rock' morphology due to saltation and mechanical weathering.
Lore & History
Historically used as a foundational building material since antiquity. Metaphysically associated with grounding, stability, and the element of Earth.