annite – מילון אנגלי-עברי
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Annite
Annite is a
phyllosilicate mineral in the
mica family. It has a chemical formula of KFe
32+AlSi
3O
10(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
General Information: Chemical Formula:KFe++3AlSi3O10(OH,F)2
Composition:(Molecular Weight = 512.88 gm)
Potassium 7.62 %
K Aluminum 5.26 %
AlIron 32.67 %
FeSilicon 16.43 %
SiHydrogen 0.29 %
H Oxygen 35.87 %
O Fluorine 1.85 %
F Empirical Formula: KFe2+3AlSi3O10(OH)1.5F0.5
Physical Properties: Cleavage:[???] Perfect
Color:reddish brown or black.
Density:3.17
Diaphaniety:Transparent to Subopaque
Hardness:2.5-3 - Finger Nail-Calcite
Luster:Sub Metallic
Streak:brownish white
More details...
ANNITE
ANNITE
annitor
annitor, anniti, annixus sum
v. lean/rest upon, support oneself, (w/genibus) kneel; strive, work, exert, try;