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|molecular weight = 512.88 g
|molecular weight = 512.88 g
|color = reddish brown
|color = reddish brown
|habit = usually in "blocks" of thin sheets or as aggregations of foliated thin scales. Includes large, well formed pseudohexagonal prisms up to 12cm across and 15cm long.<ref>Hazen, R.M. and C.W. Burnham (1973) The crystal structures
|habit = usually in "blocks" of thin sheets or as aggregations of foliated thin scales. Includes large, well formed pseudohexagonal prisms up to 12&nbsp;cm across and 15&nbsp;cm long.<ref>Hazen, R.M. and C.W. Burnham (1973) The crystal structures
of one-layer phlogopite and annite. Amer. Mineral., 58, 889{900.</ref>
of one-layer phlogopite and annite. Amer. Mineral., 58, 889{900.</ref>
|system = monoclinic, pseudohexagonal
|system = monoclinic, pseudohexagonal
|twinning = contact twins with composition surface on {001} and twin axis {310}
|twinning = contact twins with composition surface on {001} and twin axis {310}
|cleavage = perfect in one direction {001}<ref> Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming minerals, v. 3, sheet silicates,
|cleavage = perfect in one direction {001}<ref>Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming minerals, v. 3, sheet silicates,
55{84}. </ref>
55{84}.</ref>
|fracture = uneven
|fracture = uneven
|tenacity = flexible<ref> Eugster, H.P. and D.R. Wones (1962) Stability relations of the ferruginous biotite,
|tenacity = flexible<ref>Eugster, H.P. and D.R. Wones (1962) Stability relations of the ferruginous biotite,
annite. J. Petrol., 3, 82{125.</ref>
annite. J. Petrol., 3, 82{125.</ref>
|mohs = 2.5 - 3
|mohs = 2.5 - 3
|luster = submetallic to vitreous; pearly on cleavage surfaces<ref> Dana, E.S. (1892) Dana's system of mineralogy, (6th edition), 634.</ref>
|luster = submetallic to vitreous; pearly on cleavage surfaces<ref>Dana, E.S. (1892) Dana's system of mineralogy, (6th edition), 634.</ref>
|optical properties = translucent to transparent<ref>Kwak, T.A.P. and P.W.
|optical properties = translucent to transparent<ref>Kwak, T.A.P. and P.W.
Askins (1981) Geology and genesis of the F-Sn-W(-Be-Zn) skarn (wrigglite) at Moina, Tasmania.
Askins (1981) Geology and genesis of the F-Sn-W(-Be-Zn) skarn (wrigglite) at Moina, Tasmania.
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</references>
</references>
}}
}}

==References==
{{Reflist}}
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[[Category:Mica group]]
[[Category:Mica group]]



{{silicate-mineral-stub}}
{{Silicate-mineral-stub}}

Revision as of 11:06, 29 September 2010

Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+[(OH)2]AlSi3O10]. [1] Annite is the iron end member of the biotite mica group, the iron rich analogue of magnesium rich phlogopite.[2]

Annite was first described in 1868 for the first noted occurrence in Cape Ann, Rockport, Essex County, Massachusetts, USA and on Pikes Peak, El Paso Co, Colorado.[1] It occurs in igneous and metamorphic rocks that are deficient in magnesium. It occurs associated with fluorite and zircon in the type locality.[3]

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Annite
General
Categorymica group, biotite-phlogopite series. The hydroxyll analogue of Flourannite.
Formula
(repeating unit)		KFe32+[(OH)2]AlSi3O10
Crystal systemmonoclinic, pseudohexagonal
Identification
Colorreddish brown
Crystal habitusually 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.[4]
Twinningcontact twins with composition surface on {001} and twin axis {310}
Cleavageperfect in one direction {001}[5]
Fractureuneven
Tenacityflexible[6]
Mohs scale hardness2.5 - 3
Lustersubmetallic to vitreous; pearly on cleavage surfaces[7]
Streakbrownish white
Specific gravityapproximately 3.3 g/cm3
Density3.17g
Other characteristicsdiagnostic: transparent to subopaque; occurrence: in magnesium poor igneous and metamorphic rocks. </references>

References

  1. ^ a b Mindat.org
  2. ^ Deer, W. A., R. A. Howie and J. Zussman, An Introduction to the Rock Forming Minerals, Longman, 1966, p. 212 ISBN 0582442109
  3. ^ Handbook of Mineralogy
  4. ^ Hazen, R.M. and C.W. Burnham (1973) The crystal structures of one-layer phlogopite and annite. Amer. Mineral., 58, 889{900.
  5. ^ Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming minerals, v. 3, sheet silicates, 55{84}.
  6. ^ Eugster, H.P. and D.R. Wones (1962) Stability relations of the ferruginous biotite, annite. J. Petrol., 3, 82{125.
  7. ^ Dana, E.S. (1892) Dana's system of mineralogy, (6th edition), 634.
  8. ^ Kwak, T.A.P. and P.W. Askins (1981) Geology and genesis of the F-Sn-W(-Be-Zn) skarn (wrigglite) at Moina, Tasmania. Econ. Geol., 76, 439{467).

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