Gneiss or Granite Pegmatite Fragment
Metamorphic Gneiss / Igneous Rock Fragment · Mineral Specimen / Rock Fragment
Crystal System
Varies by constituent minerals (Monoclinic, Triclinic, Trigonal)
Mineral Group
Silicates (Tectosilicates and Phyllosilicates)
Chemical Formula
Complex silicate mixture (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8, etc.)
Formation Process
Metamorphic or Igneous formation under high temperature and pressure deep within the Earth's crust.
About This Crystal
An irregularly shaped, rough, grayish-white speckled rock fragment showing granular texture, uneven surfaces, and a combination of light and dark mineral grains.
Physical Characteristics
Color: Gray, white, and black speckled. Streak: White. Cleavage: Varies by mineral component. Fracture: Uneven to granular. Specific Gravity: ~2.6 - 2.8. Tenacity: Brittle.
Optical Properties
Aggregate optical properties depending on individual mineral grains such as quartz, feldspar, and biotite mica. Mostly translucent to opaque overall.
Hardness & Durability
Origin Region
Found globally in continental shields, mountain-building belts, and glacial erratics.
Hardness & Durability
Mohs hardness typically 6 to 7 for the aggregate mass, heavily dependent on the quartz and feldspar content. Durable for general handling.
Care & Maintenance
Wash with warm soapy water if needed. Resistant to normal environmental conditions, but abrasive storage should be avoided.
Rarity & Value
Common. Widely distributed across the Earth's continental crust. Low commercial value as a raw rock specimen.
Special Characteristics
Displays classic interlocking mineral grain textures typical of plutonic igneous or high-grade metamorphic rocks.
Lore & History
Used traditionally in construction and monumental architecture. In metaphysical practices, rocks containing multiple minerals are often associated with grounding, balance, and integration of diverse energies.