About: Annite   Sponge Permalink

An Entity of Type : dbkwik:resource/6IIoeMLPkySiK--1vpcViQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+AlSi3O10(OH,F)2. Annite is the iron end member of the biotite mica group, the iron rich analogue of magnesium rich phlogopite. Annite is monoclinic and contains tabular crystals and cleavage fragments with pseudohexagonal outlines. There are contact twins with composition surface {001} and twin axis {310}.

AttributesValues
rdf:type
rdfs:label
  • Annite
rdfs:comment
  • Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+AlSi3O10(OH,F)2. Annite is the iron end member of the biotite mica group, the iron rich analogue of magnesium rich phlogopite. Annite is monoclinic and contains tabular crystals and cleavage fragments with pseudohexagonal outlines. There are contact twins with composition surface {001} and twin axis {310}.
sameAs
dcterms:subject
Category
opticalprop
  • Biaxial
diaphaniety
  • translucent to transparent
mohs
  • 2(xsd:double)
Other
  • diagnostic: occurrence: in magnesium poor igneous and metamorphic rocks.
Gravity
  • approximately 3.3
Name
  • Annite
symmetry
  • Monoclinic 2/m
Caption
  • Annite sample
dbkwik:geology/pro...iPageUsesTemplate
molecular weight
  • 512.88
2V
  • Calculated: 12° to 36°
streak
  • brownish white
formula
  • KFe32+AlSi3O102
System
  • Monoclinic, pseudohexagonal
pleochroism
  • X = brown; Y = Z = dark brown
strunz
  • 9(xsd:integer)
Color
  • Brown to black
unit cell
  • a = 5.39 Å, b = 9.33 Å, c = 10.29 Å; β = 100°; Z = 2
tenacity
  • flexible
cleavage
  • perfect in one direction {001}
habit
  • usually in "blocks" of thin sheets or as aggregations of foliated thin scales. Includes large, well formed pseudohexagonal prisms up to 12 cm across and 15 cm long.
twinning
  • contact twins with composition surface on {001} and twin axis {310}
fracture
  • uneven
refractive
  • nα = 1.625 - 1.631 nβ = 1.690 nγ = 1.691 - 1.697
luster
  • submetallic to vitreous; pearly on cleavage surfaces
abstract
  • Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+AlSi3O10(OH,F)2. Annite is the iron end member of the biotite mica group, the iron rich analogue of magnesium rich phlogopite. Annite is monoclinic and contains tabular crystals and cleavage fragments with pseudohexagonal outlines. There are contact twins with composition surface {001} and twin axis {310}. Annite was first described in 1868 for the first noted occurrence in Cape Ann, Rockport, Essex County, Massachusetts, US. It also occurs on Pikes Peak, El Paso County, Colorado. It occurs in igneous and metamorphic rocks that are deficient in magnesium. It occurs associated with fluorite and zircon in the type locality.
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