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Aenigmatite

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Aenigmatite
Aenigmatite, also known as Cossyrite after Cossyra, the ancient name of Pantelleria, is a sodiumirontitanium inosilicate mineral. The chemical formula is Na2Fe2+5TiSi6O20 and its structure consists of single tetrahedral chains with a repeat unit of four and complex side branches. It forms brown to black triclinic lamellar crystals. It has Mohs hardness of 5.5 to 6 and specific gravity of 3.74 to 3.85. Aenigmatite forms a solid-solution series with wilkinsonite, Na2Fe2+4Fe3+2Si6O20.

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Mineralogy Database Dictionary

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Aenigmatite

General Information:
 Chemical Formula:
Na2Fe++5TiSi6O20
 Composition:
(Molecular Weight = 861.60 gm)
Sodium 5.34 % Na
Titanium 5.56 % Ti
Iron 32.41 % Fe
Silicon 19.56 % Si
Oxygen 37.14 % 
 Empirical Formula:
Na2Fe2+5TiSi6O20
 Environment:
Sodalite-syenite rocks.
 IMA Status:
Approved IMA 1963
 Locality:
TL: Julianehaab district in southern Greenland.
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
brown or black.
 Density:
3.74 - 3.85, Average = 3.79
 Diaphaniety:
Opaque
 Habits:
Lamellar - Thin laminae producing a lamellar structure., ,
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luminescence:
Non-fluorescent.
 Luster:
Subadamantine
 Streak:
reddish brown
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Dizionario inglese-italiano 1.0.012

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AENIGMATITE
ENIGMATITE


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