General Information:
Chemical Formula:Ca2Mn++Al2BO3Si4O12(OH)
Composition:(Molecular Weight = 628.02 gm)Calcium 12.76 %
CaManganese 8.75 %
MnAluminum 8.59 %
AlSilicon 17.89 %
SiBoron 3.44 %
B Hydrogen 0.16 %
H Oxygen 48.40 %
O Empirical Formula: Ca2Mn2+Al2(BO3)Si4(O)12(OH)
Environment:Contact metamorphic, hydrothermal, and alpine vein rocks.
Name Origin:From the Greek acine - "axe" in allusion to the acute shape of typical crystals and the from the Latin magnes = "magnet" in reference to Mn in the chemical formula.
Physical Properties: Cleavage:[100] Distinct, [001] Poor, [110] Poor
Color:brown, colorless, yellowish, pale violet, or reddish.
Density:3.27 - 3.29, Average = 3.28
Diaphaniety:Transparent to subtranslucent
Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Lamellar - Thin laminae producing a lamellar structure.,
Hardness:6.5-7 - Pyrite-Quartz
Luminescence:Fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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