Quartz in Matrix
Quartz var. Crystalline Quartz with Lithic Matrix · Mineral Specimen / Decorative Stone
Crystal System
Trigonal; typically occurs in this specimen as massive to microcrystalline aggregates within the matrix.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of surrounding rock matrix
Formation Process
Formed via hydrothermal processes where silica-rich fluids permeate cracks in pre-existing host rock, or through metamorphic processes involving recrystallization.
About This Crystal
This specimen features translucent to milky white crystalline quartz embedded within a dark, fine-grained host rock (matrix). The quartz exhibits a vitreous luster and irregular grain boundaries, with some areas showing ochre-colored iron staining.
Physical Characteristics
Color: White to colorless; Streak: White; Hardness: 7; Fracture: Conchoidal; Luster: Vitreous; Transparency: Translucent to opaque. Specific Gravity: ~2.65.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Doubly refractive; No significant pleochroism or dispersion in this opaque/translucent form.
Hardness & Durability
Origin Region
Global distribution; commonly found in mountainous regions such as the Appalachian Mountains (USA), the Alps (Europe), or the Minas Gerais region of Brazil.
Hardness & Durability
Quartz has a Mohs hardness of 7, making it highly durable and resistant to scratching, though the host matrix may be softer and more prone to erosion.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals that might dissolve the matrix stone. Generally stable under light and heat.
Rarity & Value
Common; value is generally low for raw mineral specimens of this type, often used for educational purposes or as decorative garden/landscape stones.
Special Characteristics
Features iron oxide staining (limonite/hematite) providing the brownish-orange tints on the quartz surfaces; exhibits typical 'greasy' feel on surfaces of mass quartz.
Lore & History
Quartz has been used since antiquity for toolmaking and decoration. Historically, it was believed by Greeks to be 'permanent ice.' In metaphysical lore, it is considered a 'master healer' and amplifier of energy.