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gptkbp:instanceOf
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Mineral group
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gptkbp:category
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Inosilicate minerals
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gptkbp:chemicalFormula
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(Ca,Na)2-3(Mg,Fe,Al)5(Si,Al)8O22(OH)2
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gptkbp:cleavage
|
56 and 124 degrees
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gptkbp:color
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Black
Brown
Colorless
Green
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gptkbp:containsElement
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gptkb:Oxygen
gptkb:Calcium
gptkb:Hydrogen
Iron
Aluminum
Sodium
Magnesium
Silicon
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gptkbp:crystalSystem
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Monoclinic
Orthorhombic
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gptkbp:density
|
2.9–3.6 g/cm³
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gptkbp:distinctFrom
|
Pyroxenes have cleavage at 90 degrees
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gptkbp:distinctiveFeature
|
Double chain silicate structure
Two directions of cleavage at 56 and 124 degrees
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gptkbp:environmentalImpact
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Hydrous igneous rocks
Medium to high grade metamorphic rocks
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gptkbp:event
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Igneous rocks
Metamorphic rocks
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gptkbp:habit
|
Prismatic crystals
Fibrous aggregates
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gptkbp:hardnessMohs
|
5-6
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|
https://www.w3.org/2000/01/rdf-schema#label
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Amphibole minerals
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gptkbp:luster
|
Vitreous
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gptkbp:namedFor
|
gptkb:René_Just_Haüy
|
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gptkbp:nameOrigin
|
Greek 'amphibolos' meaning ambiguous
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gptkbp:opticalProperties
|
Biaxial (+/-)
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gptkbp:radioactive
|
Non-radioactive
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gptkbp:relatedTo
|
Pyroxene minerals
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gptkbp:solubility
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Insoluble in water
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gptkbp:structureType
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Double chain silicate
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gptkbp:subclassOf
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gptkb:Silicate_minerals
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gptkbp:transparency
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Translucent to opaque
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gptkbp:type
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gptkb:Hornblende
gptkb:Anthophyllite
gptkb:Actinolite
gptkb:Tremolite
gptkb:Glaucophane
gptkb:Riebeckite
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gptkbp:uses
|
Asbestos (some members)
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gptkbp:bfsParent
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gptkb:Amphibolite
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gptkbp:bfsLayer
|
8
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