Chlorite included Quartz with Host Rock
Quartz var. Chlorite-included Quartz (SiO2 + (Mg,Fe)3(Si,Al)4O10(OH)2(Mg,Fe)3(OH)6) · Mineral Specimen / Decorative Stone / Lapidary Material
Crystal System
Trigonal (Quartz) / Monoclinic (Chlorite); Habit: Massive vein filling, granular, and microcrystalline seams.
Mineral Group
Silicates (Tectosilicate Quartz and Phyllosilicate Chlorite group)
Chemical Formula
SiO2 (Quartz) with (Mg,Fe)5Al(AlSi3)O10(OH)8 (Chlorite group minerals)
Formation Process
Hydrothermal/Metamorphic: Formed by the precipitation of silica from hot, mineral-rich fluids in fractures within metamorphic host rock, with chlorite minerals providing the green coloration through inclusion or alteration.
About This Crystal
The specimen features opaque to translucent white quartz veins cutting through a dark, fine-grained metamorphic host rock. Patches of dull, earthy-to-waxy green chlorite are interwoven with the quartz, giving it a mossy or variegated appearance. The luster is vitreous on fresh quartz surfaces and dull/earthy on the host rock and chlorite-rich areas.
Physical Characteristics
Color: White, grey, and forest green; Streak: White; Cleavage: None in quartz, perfect basal cleavage in chlorite (though not visible in massive form); Fracture: Conchoidal to uneven; Specific Gravity: ~2.6-2.8; Luster: Vitreous to dull.
Optical Properties
Quartz is uniaxial positive with a refractive index of 1.544-1.553. In this massive/opaque state, it typically lacks transparency or visible pleochroism. No significant optical phenomena like chatoyancy are visible.
Hardness & Durability
Origin Region
Common worldwide in metamorphic terrains; notable sources include the Swiss Alps, Brazil, and the Appalachian Mountains (USA). Formed in hydrothermal veins and metamorphic schist/gneiss.
Hardness & Durability
Mohs Hardness: 6.5 to 7 (Quartz is 7, Chlorite is 2-3); Toughness: Fair to good; Stability: Stable under normal conditions but the softer green minerals can be scratched easily compared to the quartz.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals that might penetrate the porous host rock or react with the chlorite. Store away from harder gemstones like sapphire or diamond to prevent scratching.
Rarity & Value
Common; Value is generally low for raw specimens, often sold as decorative garden stones or rough lapidary material. Value increases if the quartz shows clear crystal points or distinct 'phantom' inclusions.
Special Characteristics
Possesses a 'salt and pepper' or 'mossy' aesthetic due to the contrast between the white silica and green silicate inclusions. Non-fluorescent under UV light.
Lore & History
Historically used as a building material or for simple stone tools. In metaphysical traditions, chlorite-included quartz is often referred to as a 'healer's stone,' associated with the heart chakra and believed to assist with detoxification and grounding, though these are not scientific claims.