Ceylonite
Ceylonite (first cited 1793) and pleonaste (first cited 1801) are dingy blue or grey to black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel with Mg:Fe from 3:1 and 1:1, and little or no ferric iron. Pleonaste is named from the Greek for 'abundant,' for its many crystal forms, and is distinguished chemically by low Mg:Fe ratios of approximately 1:3. It is sometimes used as a gemstone.
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Ceylonite
Ceylonite (first cited 1793) and pleonaste (first cited 1801) are dingy blue or grey to black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel with Mg:Fe from 3:1 and 1:1, and little or no ferric iron. Pleonaste is named from the Greek for 'abundant,' for its many crystal forms, and is distinguished chemically by low Mg:Fe ratios of approximately 1:3. It is sometimes used as a gemstone.
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Ceylonite (first cited 1793) a ...... sometimes used as a gemstone.
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839,230,726
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category
cleavage
Indistinct
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color
Various; red to blue to mauve, dark green, brown, black
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diaphaneity
Transparent to translucent
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formula
Al2O4
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fracture
Conchoidal, uneven
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gravity
habit
Cubic, octahedral
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imagesize
luster
Vitreous
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mohs
opticalprop
Isotropic
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Other
Nonmagnetic, non-radioactive, sometimes fluorescent
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pleochroism
Absent
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refractive
solubility
none
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streak
White
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system
Isometric
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subject
comment
Ceylonite (first cited 1793) a ...... sometimes used as a gemstone.
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label
Ceylonite
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