Massive Quartz with Mica
Quartz (Silica) with Muscovite/Biotite inclusions · Mineral Specimen / Common Rock Component
Crystal System
Trigonal system; typically appears in massive, cryptocrystalline, or granular habit in rock specimens like this.
Mineral Group
Silicates (Tectosilicate group for Quartz; Phyllosilicate group for Mica)
Chemical Formula
SiO2 with KAl2(AlSi3O10)(OH)2 (Mica)
Formation Process
Forms primarily through Igneous (magmatic) cooling or Metamorphic processes where silica-rich fluids crystallize.
About This Crystal
Opaque to translucent grey-white stone with a grainy texture. Luster is dull to vitreous with tiny reflective mica flecks and fine surface cracks.
Physical Characteristics
Color: Grey-white with dark specks; Streak: White; Fracture: Conchoidal to uneven; Specific Gravity: 2.65; Fluorescence: Generally none.
Optical Properties
Uniaxial positive; Refractive index ~1.544-1.553; Non-pleochroic; Opaque in massive form as shown.
Hardness & Durability
Origin Region
Globally abundant; found in major mountain ranges including the Alps, Andes, and Himalayas.
Hardness & Durability
Mohs hardness of 7 (Quartz component); very durable and stable for outdoor exposure.
Care & Maintenance
Highly resistant; clean with warm soapy water. Can be scrubbed with a soft brush to remove surface dirt.
Rarity & Value
Common; low monetary value as a raw specimen. Valued primarily for geological interest or landscape use.
Special Characteristics
Contains micro-crystalline inclusions of mica that provide a subtle 'sparkle' or schistose sheen on the surface under direct light.
Lore & History
Quartz has been used since the Paleolithic for tools. Historically called 'Ancient Ice' by Greeks; traditionally associated with clarity and amplification.