Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+AlSi3O10(OH)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}.
Key facts
- Mineral.name
- Annite
- Mineral.category
- Phyllosilicate minerals
- Mineral.group
- Mica group, trioctahedral mica group, biotite subgroup
- Mineral.image
- Annite-pas-130ab.jpg
- Mineral.caption
- Annite sample
- Mineral.formula
- KFe32+AlSi3O10(OH,F)2
- Mineral.IMAsymbol
- Ann <!--not a parameter
- Mineral.molecular weight
- 512.88 g/mol -->
- Mineral.strunz
- 9.EC.20
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- C2/m
- Mineral.unit cell
- a = 5.39, b = 9.33 c = 10.29 [Å]; β = 100°; Z = 2
- Mineral.color
- Brown to black
- Mineral.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.
- Mineral.twinning
- Contact twins with composition surface on {001} and twin axis {310}
- Mineral.cleavage
- Perfect in one direction {001}
- Mineral.fracture
- Uneven
via Wikipedia infobox
Wikidata facts
- Subclass of
- biotite series
- Named after
- Cape Ann
- Image
- Annite-pas-130ab.jpg
Show 7 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EC.20
- Nickel-Strunz 9th edition (updated 2009)
- 9.EC.20
- Commons category
- Annite
- type locality (geology)
- Rockport
- crystal system
- monoclinic crystal system
- IMA Mineral Symbol
- Ann
- Strunz 8th edition (series ID, updated)
- VIII/E.05b
via Wikidata · CC0
Article · 日本語
鉄雲母（てつうんも、Annite）は、雲母グループのフィロケイ酸塩鉱物。 化学組成は、KFe32+AlSi3O10(OH,F)2である。Fe2+ が Mg に置換した雲母が金雲母（phlogopite）で、金雲母と共に黒雲母の端成分である。 鉄雲母は、1868年のアメリカ合衆国マサチューセッツ州エセックス郡のアン岬で、初めて発見された。
Abstract from DBpedia / Wikipedia · CC BY-SA