Granite or Feldspar Rock Fragment
Feldspar-bearing Rock / Potassium Feldspar · Mineral Specimen / Rock Fragment
Crystal System
Triclinic or Monoclinic (depending on feldspar type), massive and granular habit
Mineral Group
Silicates (specifically Tectosilicates)
Chemical Formula
KAlSi3O8 (Potassium Feldspar component)
Formation Process
Igneous crystallization from cooling magma, frequently found in intrusive igneous rocks like granite
About This Crystal
An opaque, weathered, water-worn pebble showing pinkish and greyish tones. The surface is dull and rough due to weathering, with granular texture and uneven fracture planes reflecting light poorly.
Physical Characteristics
Color ranges from pink to greyish-white; streak is white; cleavage is good in two directions at roughly 90 degrees; fracture is uneven to conchoidal; specific gravity is approximately 2.5 to 2.7; brittle tenacity; non-magnetic.
Optical Properties
Biaxial optical character with low birefringence; generally opaque to translucent in thin sections; no significant special optical phenomena visible in this weathered state.
Hardness & Durability
Origin Region
Found globally in continental crusts, commonly found in glacial tills, riverbeds, and weathered outcrops
Hardness & Durability
Mohs hardness of 6; moderate toughness but susceptible to cleavage breakage; moderate durability, suitable for general handling but prone to surface abrasion.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh acids or ultrasonic cleaners; store away from harder minerals to prevent scratching.
Rarity & Value
Extremely common; low commercial value, typically collected as a common geological specimen or tumbling rough.
Special Characteristics
Displays typical weathering crust and granular interlocking mineral grains characteristic of common intrusive igneous rocks.
Lore & History
Used traditionally in earth-based grounding practices and architectural construction throughout human history. As a common rock component, it represents stability and connection to the Earth in modern crystal lore, though these are non-scientific beliefs.