Bettertonite
Bettertonite is a mineral of the arsenate category, named after John Betterton. He was a museum geologist and mineralogist at Haslemere Educational Museum in Surrey, England. Bettertonite is a white arsenate mineral with a formula of [Al6(AsO4)3(OH)9(H2O)5]・11H2O. Bettertonite is in the monoclinic system and has a heteropolyhedral layered structure type. It is a natural forming polyoxometalate. Bettertonite forms in clusters of radiating rectangular laths. Laths are thin and usually < 20 μm laterally. Laths are flat on {010}. Bettertonite is similar to penberthycroftyite and it transforms into penberthycroftyite at low temperatures (67-97 ℃).
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Bettertonite
Bettertonite is a mineral of the arsenate category, named after John Betterton. He was a museum geologist and mineralogist at Haslemere Educational Museum in Surrey, England. Bettertonite is a white arsenate mineral with a formula of [Al6(AsO4)3(OH)9(H2O)5]・11H2O. Bettertonite is in the monoclinic system and has a heteropolyhedral layered structure type. It is a natural forming polyoxometalate. Bettertonite forms in clusters of radiating rectangular laths. Laths are thin and usually < 20 μm laterally. Laths are flat on {010}. Bettertonite is similar to penberthycroftyite and it transforms into penberthycroftyite at low temperatures (67-97 ℃).
has abstract
Bettertonite is a mineral of t ...... at low temperatures (67-97 ℃).
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62,027,032
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989,071,494
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birefringence
δ = 0.012
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category
class
Prismatic
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cleavage
Perfect cleavage on {010}
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color
White
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diaphaneity
Translucent
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formula
[Al6395]・11H2O
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fracture
Not observed
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habit
Ultrathin rectangular laths
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luster
Vitreous, Silky, Pearly
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mohs
Not observed
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molweight
name
Bettertonite
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opticalprop
Biaxial positive α = 1.511 , β = 1.517 , γ = 1.523
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pleochroism
Non-pleochroic
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prop
Group
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prop1text
Arsenates
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refractive
Not observed
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streak
White
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tenacity
Not observed
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twinning
Not observed
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unit cell
a = 7.773 Å; b = 26.991 Å; c = 15.867 Å; β = 94.22°
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wikiPageUsesTemplate
subject
comment
Bettertonite is a mineral of t ...... at low temperatures (67-97 ℃).
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label
Bettertonite
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sameAs
wasDerivedFrom
isPrimaryTopicOf
name
Bettertonite
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