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Åkermanite (Ca2Mg[Si2O7]) is a melilite mineral of the sorosilicate group, containing  calciummagnesiumsilicon, and oxygen. It is a product of contact metamorphism of siliceous limestones and dolostones, and rocks of sanidinite facies. Sanidinite facies represent the highest conditions of temperature of contact metamorphism and are characterized by the absence of hydrous minerals. It has a density of 2.944 g/cm3. Åkermanite ranks a 5 or 6 on the Mohs scale of mineral hardness, and can be found grey, green, brown, or colorless. It has a white streak and a vitreous or resinous luster. It has a tetragonal crystal system and a good, or distinct, cleavage. It is the end member in a solid solution series beginning with gehlenite (Ca2Al[AlSiO2]).

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nf. akermanite

Mineralogy Database Dictionary

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