Anthophyllite

Anthophyllite is an amphibole mineral: (Mg, Fe)7Si8O22(OH)2, magnesium iron inosilicate hydroxide. Anthophyllite is polymorphic with cummingtonite. Some forms of anthophyllite are lamellar or fibrous and are used as asbestos. The name is derived from the Latin word anthophyllum, meaning clove, an allusion to the most common color of the mineral.
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Noun
1. a dark brown mineral of the amphibole group; magnesium iron silicate
(hypernym) amphibole
(member-holonym) amphibole group

n. anthophyllite

(n.)
A mineral of the hornblende group, of a yellowish gray or clove brown color.
  

General Information:
 Chemical Formula:
[ ]Mg7Si8O22(OH)2
 Composition:
(Molecular Weight = 780.82 gm)
Magnesium 21.79 % Mg
Silicon 28.78 % Si
Hydrogen 0.26 % H 
Oxygen 49.18 % O 
 Empirical Formula:
Mg7(Si8O22)(OH)2
 Environment:
Metamorphic rocks.
 IMA Status:
Approved IMA 1978
 Locality:
Bodenmais, Germany. Montana, USA.
 Name Origin:
From the Latin anthophyllum - "clove" in allusion to the color.
Physical Properties:
 Cleavage:
[110] Perfect, [???] Distinct, [???] Distinct
 Color:
white, greenish gray, green, clove brown, or brownish green.
 Density:
2.85 - 3.57, Average = 3.21
 Diaphaniety:
Transparent to translucent
 Habits:
Fibrous - Crystals made up of fibers., Lamellar - Thin laminae producing a lamellar structure., Massive - Uniformly indistinguishable crystals forming large masses.
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous - Pearly
 Streak:
gray
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Atomic Mass : 231.03588
Atomic Number : 91
Name Origins: Greek, protos = "first."
Year Discovered : 1917
Discovery Credits : Discovered by Otto Hahn and Lise Meitner at Berlin, by K. Fajans at Karlsruhe, Germany, and by F. Soddy, J. A. Cranston, and A. Fleck at Glasgow, Scotland.
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Atomic Mass : 231.03588
Atomic Number : 91
Name Origins: Greek, protos = "first."
Year Discovered : 1917
Discovery Credits : Discovered by Otto Hahn and Lise Meitner at Berlin, by K. Fajans at Karlsruhe, Germany, and by F. Soddy, J. A. Cranston, and A. Fleck at Glasgow, Scotland.
More Details