Akermanite

n. akermanite

General Information:
 Chemical Formula:
Ca2MgSi2O7
 Composition:
(Molecular Weight = 272.63 gm)
Calcium 29.40 % Ca
Magnesium 8.92 % Mg
Silicon 20.60 % Si
Oxygen 41.08 % O 
 Empirical Formula:
Ca2Mg(Si2O7)
 Environment:
Calcium end-member of the melilite series. Found only in metallurgical slags.
 Locality:
TL: Sweden, unspecified locality
Physical Properties:
 Cleavage:
[001] Distinct, [110] Indistinct
 Color:
colorless, grayish, green, or brown.
 Density:
2.944
 Diaphaniety:
Transparent to Translucent
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Vitreous - Resinous
 Streak:
white
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