Povondraite
Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe3+3(Fe3+4,Mg2)(BO3)3Si6O18(OH)3O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations. It occurs as rare fracture and cavity encrustations within schists derived from sedimentary rocks. Associated minerals include quartz, potassium feldspar, muscovite, schorl, riebeckite and magnesite.
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Povondraite
Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe3+3(Fe3+4,Mg2)(BO3)3Si6O18(OH)3O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations. It occurs as rare fracture and cavity encrustations within schists derived from sedimentary rocks. Associated minerals include quartz, potassium feldspar, muscovite, schorl, riebeckite and magnesite.
has abstract
La povondraite è un minerale.
@it
La povondraíta es un mineral d ...... n: ferridravita y IMA1978-075.
@es
La povondraïta és un mineral d ...... mica del grup de la turmalina.
@ca
Povondraita silikato motako minerala da eta tourmalina taldearen kidea da.
@eu
Povondraite is a rare silicate ...... ical Association in the 1990s.
@en
Povondraïet is een weinig voor ...... len en heeft een zwarte kleur.
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Wikipage page ID
32,487,685
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Wikipage revision ID
1,015,966,564
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birefringence
caption
The crystals here are black, l ...... ough the fissures in the rock.
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category
Cyclosilicates
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class
Hemimorphic trigonal
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cleavage
None observed
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colour
Dark brown to brown-black, black
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dana
diaphaneity
Translucent
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fracture
Irregular, conchoidal
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habit
Prismatic, striated
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impurities
K,Mg,Al,Cu,Pb,Sn,Ti,V,H2O
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luster
Resinous
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molweight
refractive
streak
Brown
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symmetry
system
Hexagonal-Rhomboidal
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tenacity
Brittle
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unit cell
a=16.18Å, c=7.44Å
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wikiPageUsesTemplate
subject
hypernym
comment
La povondraite è un minerale.
@it
La povondraíta es un mineral d ...... n: ferridravita y IMA1978-075.
@es
La povondraïta és un mineral d ...... mica del grup de la turmalina.
@ca
Povondraita silikato motako minerala da eta tourmalina taldearen kidea da.
@eu
Povondraite is a rare silicate ...... orl, riebeckite and magnesite.
@en
Povondraïet is een weinig voor ...... len en heeft een zwarte kleur.
@nl
label
Povondraita
@eu
Povondraite
@en
Povondraite
@it
Povondraíta
@es
Povondraïet
@nl
Povondraïta
@ca