About: Kornerupine   Sponge Permalink

An Entity of Type : owl:Thing, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Kornerupine was a rare fancy stone usually found in stream beds, eskers, or ridge-pit gravel.

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rdfs:label
  • Kornerupine
  • Kornerupine
rdfs:comment
  • Kornerupine was a rare fancy stone usually found in stream beds, eskers, or ridge-pit gravel.
  • Kornerupine is a rare boro-silicate mineral with formula: (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic - dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.34. Its indices of refraction are nα=1.660 - 1.671, nβ=1.673 - 1.683 and nγ=1.674 - 1.684. It occurs In boron-rich volcanic and sedimentary rocks which have undergone high grade metamorphism. It is also found in metamorphosed anorthosite complexes.
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dbkwik:ceramica/pr...iPageUsesTemplate
dbkwik:forgotten-r...iPageUsesTemplate
dbkwik:forgottenre...iPageUsesTemplate
Rules
  • 1(xsd:integer)
Name
  • Kornerupine
Type
Value
  • 100(xsd:integer)
Caption
  • Cut kornerupine gem.
abstract
  • Kornerupine was a rare fancy stone usually found in stream beds, eskers, or ridge-pit gravel.
  • Kornerupine is a rare boro-silicate mineral with formula: (Mg,Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It crystallizes in the orthorhombic - dipyramidal crystal system as brown, green, yellow to colorless slender tourmaline like prisms or in massive fibrous forms. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.34. Its indices of refraction are nα=1.660 - 1.671, nβ=1.673 - 1.683 and nγ=1.674 - 1.684. It occurs In boron-rich volcanic and sedimentary rocks which have undergone high grade metamorphism. It is also found in metamorphosed anorthosite complexes. Kornerupine is valued as a gemstone when it is found in translucent green to yellow shades. The emerald green varieties are especially sought after. It was first described in 1887 for an occurrence in Fiskernaes in SW Greenland. It was named in honor of the Danish geologist, Andreas Nikolaus Kornerup (1857{1883).
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