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Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. Fluorite comes in a wide range of colors and has consequently been dubbed "the most colorful mineral in the world". Every color of the rainbow in various shades is represented by fluorite samples, along with white, black, and clear crystals.
Rhombohedral cleavage occurs when there are three cleavage planes intersecting at angles that are not 90 degrees. Calcite has rhombohedral cleavage. Octahedral cleavage occurs when there are four cleavage planes in a crystal. Fluorite exhibits perfect octahedral cleavage. Octahedral cleavage is common for semiconductors.
Color: Colorless to pale yellow: Crystal habit: Thin tabular, prismatic to needle-like crystals commonly in radial clusters: Twinning: Common on {011} or {021} forming heart- or V-shaped twins: Cleavage: Perfect on {001}; distinct on {100}, {010} and {110} Mohs scale hardness: 6–7: Luster: Vitreous, pearly on cleavage surfaces: Diaphaneity ...
Cleavage: On {10 1 1} perfect; parting on {10 1 2} ... This is the reason for the rose color of rhodochrosite. ... Rhodochrosite with fluorite, ...
Color: Colorless to white, pale gray, pale blue; may be yellowish red to red due to hematite inclusions ... Cleavage: Perfect on [100], [010], [001] ... fluorite and ...
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The color of a chicken yolk, cookbook author and backyard chicken expert Lisa Steele told Fox News Digital, "is completely dependent on the hen's diet." Steele, who lives in Maine, is the creator ...
The pink color of tourmalines from many localities is the result of prolonged natural irradiation. During their growth, these tourmaline crystals incorporated Mn 2+ and were initially very pale. Due to natural gamma ray exposure from radioactive decay of 40 K in their granitic environment, gradual formation of Mn 3+ ions occurs, which is ...