Prehnite
Prehnite is an inosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system, and most often forms as stalactitic or botryoidal aggregates, with only just the crests of small crystals showing any faces, which are almost always curved or composite. Very rarely will it form distinct, well-individualized crystals showing a square-like cross-section, including those found at the in Asbestos, Quebec, Canada. Prehnite is brittle with an uneven fracture and a vitreous to pearly luster. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to yellow, but also colorless, blue, pink or white. In April 2000, rare orange prehnite was
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Prehnite
Prehnite is an inosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system, and most often forms as stalactitic or botryoidal aggregates, with only just the crests of small crystals showing any faces, which are almost always curved or composite. Very rarely will it form distinct, well-individualized crystals showing a square-like cross-section, including those found at the in Asbestos, Quebec, Canada. Prehnite is brittle with an uneven fracture and a vitreous to pearly luster. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to yellow, but also colorless, blue, pink or white. In April 2000, rare orange prehnite was
has abstract
Het mineraal prehniet is een c ...... l behoort tot de inosilicaten.
@nl
La prehnita es un mineral del ...... e a partir del de una persona.
@es
La prehnita és un mineral de l ...... Bona Esperança, a Sud-àfrica.
@ca
La prehnite est une espèce min ...... res pouvant atteindre 4,5 cm .
@fr
La prehnite è un minerale allu ...... ona Speranza dal 1768 al 1780.
@it
Prehnit är ett grönaktigt mineral som består av hydroxidhaltig kalciumaluminiumsilikat.
@sv
Prehnit – nazwa pochodzi od na ...... dy glinokrzemianów wstęgowych.
@pl
Prehnit, veraltet auch als Aed ...... hnit-Katzenaugen sind bekannt.
@de
Prehnita (português brasileiro ...... subclasse dos filossilicatos.
@pt
Prehnita mineral bat da.
@eu
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birefringence
δ = 0.021 - 0.033
@en
category
class
Pyramidal
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cleavage
Distinct on [001]
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color
Colorless to gray to yellow, yellow-green or white
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dana
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diaphaneity
Semi-transparent to translucent
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dispersion
weak r > v
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fluorescence
Fluorescent, short UV=blue white mild peach, long UV=yellow
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formula
Ca2Al2
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gravity
habit
Globular, reniform to stalactitic
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imagesize
luster
Vitreous - pearly
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name
Prehnite
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opticalprop
Biaxial
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refractive
nα = 1.611 - 1.632
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nβ = 1.615 - 1.642
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nγ = 1.632 - 1.665
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streak
White
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strunz
symmetry
P2cm
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tenacity
Brittle
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twinning
Fine lamellar
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wikiPageUsesTemplate
subject
hypernym
comment
Het mineraal prehniet is een c ...... l behoort tot de inosilicaten.
@nl
La prehnita es un mineral del ...... ello color verde que es único.
@es
La prehnita és un mineral de l ...... Bona Esperança, a Sud-àfrica.
@ca
La prehnite est une espèce min ...... res pouvant atteindre 4,5 cm .
@fr
La prehnite è un minerale allu ...... ona Speranza dal 1768 al 1780.
@it
Prehnit är ett grönaktigt mineral som består av hydroxidhaltig kalciumaluminiumsilikat.
@sv
Prehnit – nazwa pochodzi od na ...... dy glinokrzemianów wstęgowych.
@pl
Prehnit, veraltet auch als Aed ...... it zusätzlichen Hydroxidionen.
@de
Prehnita (português brasileiro ...... subclasse dos filossilicatos.
@pt
Prehnita mineral bat da.
@eu
label
Prehniet
@nl
Prehnit
@de
Prehnit
@pl
Prehnit
@sv
Prehnita
@ca
Prehnita
@es
Prehnita
@eu
Prehnita
@pt
Prehnite
@en
Prehnite
@fr
wasDerivedFrom
isPrimaryTopicOf
name
Prehnite
@en