Asked by juhh
Chemical formula Mineral Group Hardness specific gravity Transparency colors streak luster cleavage fracture source, and uses of calcite
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- Chemical formula: CaCO3 (calcium carbonate)
- Mineral group: Carbonates — specifically the calcite group.
- Hardness: Mohs 3
- Specific gravity (density): ~2.71
- Transparency: transparent to translucent (many crystals are transparent; massive forms often translucent to opaque)
- Typical colors: usually colorless or white when pure; common impurity colors include pale yellow, brown, gray, red, green, blue, black (depends on inclusions/impurities)
- Streak: white
- Luster: vitreous (glassy) on crystal faces; pearly on cleavage surfaces
- Cleavage: perfect in three directions producing rhombohedral cleavage (angles about 105° and 75°); crystals commonly form rhombohedra and scalenohedra
- Fracture: conchoidal to uneven when not breaking along cleavage planes
- Diagnostic tests/optical properties (short): effervesces (fizzes) strongly with dilute HCl; exhibits strong birefringence/double refraction (Iceland spar produces double images). Refractive indices: nω ≈ 1.658, nε ≈ 1.486 (birefringence ≈ 0.172).
- Typical sources/geologic occurrence: extremely common — main constituent of limestones and marbles (sedimentary and metamorphic rocks), vein and cavity fillings, cave deposits (stalactites/stalagmites), hydrothermal veins and replacement deposits. Notable localities: Iceland (Iceland spar), Mexico (large scalenohedral crystals), Elmwood Mine (Tennessee, USA), various limestone and marble quarries worldwide.
- Common associated minerals: aragonite, dolomite, siderite, gypsum, fluorite, quartz, sulfide minerals.
- Uses:
- Construction: crushed limestone aggregate, building stone (marble), dimension stone
- Cement and lime production: CaCO3 is calcined to produce quicklime (CaO) and employed in cement manufacture
- Soil and water treatment: agricultural lime to neutralize acidic soils; pH control in water treatment
- Industrial raw material/filler: filler and extender in paint, plastics, rubber, paper, adhesives, ceramics and glass manufacture
- Metallurgy: flux in steel and smelting processes
- Pharmaceuticals and food: calcium supplements, antacids, and as a food additive (in regulated forms)
- Optical and scientific: high-quality transparent calcite (Iceland spar) used for polarizing optics and demonstration of double refraction
- Decorative: cut and polished as gemstones or ornamental stone (marble)
- Environmental: used in CO2 capture/neutralization processes and various chemical applications
If you want, I can expand on specific industrial uses (e.g., grades used for paper vs. construction), notable localities with images, or safety/handling information.
- Mineral group: Carbonates — specifically the calcite group.
- Hardness: Mohs 3
- Specific gravity (density): ~2.71
- Transparency: transparent to translucent (many crystals are transparent; massive forms often translucent to opaque)
- Typical colors: usually colorless or white when pure; common impurity colors include pale yellow, brown, gray, red, green, blue, black (depends on inclusions/impurities)
- Streak: white
- Luster: vitreous (glassy) on crystal faces; pearly on cleavage surfaces
- Cleavage: perfect in three directions producing rhombohedral cleavage (angles about 105° and 75°); crystals commonly form rhombohedra and scalenohedra
- Fracture: conchoidal to uneven when not breaking along cleavage planes
- Diagnostic tests/optical properties (short): effervesces (fizzes) strongly with dilute HCl; exhibits strong birefringence/double refraction (Iceland spar produces double images). Refractive indices: nω ≈ 1.658, nε ≈ 1.486 (birefringence ≈ 0.172).
- Typical sources/geologic occurrence: extremely common — main constituent of limestones and marbles (sedimentary and metamorphic rocks), vein and cavity fillings, cave deposits (stalactites/stalagmites), hydrothermal veins and replacement deposits. Notable localities: Iceland (Iceland spar), Mexico (large scalenohedral crystals), Elmwood Mine (Tennessee, USA), various limestone and marble quarries worldwide.
- Common associated minerals: aragonite, dolomite, siderite, gypsum, fluorite, quartz, sulfide minerals.
- Uses:
- Construction: crushed limestone aggregate, building stone (marble), dimension stone
- Cement and lime production: CaCO3 is calcined to produce quicklime (CaO) and employed in cement manufacture
- Soil and water treatment: agricultural lime to neutralize acidic soils; pH control in water treatment
- Industrial raw material/filler: filler and extender in paint, plastics, rubber, paper, adhesives, ceramics and glass manufacture
- Metallurgy: flux in steel and smelting processes
- Pharmaceuticals and food: calcium supplements, antacids, and as a food additive (in regulated forms)
- Optical and scientific: high-quality transparent calcite (Iceland spar) used for polarizing optics and demonstration of double refraction
- Decorative: cut and polished as gemstones or ornamental stone (marble)
- Environmental: used in CO2 capture/neutralization processes and various chemical applications
If you want, I can expand on specific industrial uses (e.g., grades used for paper vs. construction), notable localities with images, or safety/handling information.
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