A product of contact metamorphism of siliceous limestones and dolostones, and in rocks of the sanidinite facies. Also, forms from alkalic magmas rich in calcium.
IMA Status:
Valid Species (Pre-IMA) 1884
Locality:
Occurrences are typically of intermediate series members; relatively pure examples have been found at Monte Somma and Vesuvius, Campania, and Monte Cavalluchio, Sacrofano, near Rome, L
Link to MinDat.org Location Data.
Name Origin:
For Anders Richard Akerman (1837-1922), Swedish metallurgist.
CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2163,KPDmeas= 0.216,KC= 0.2076 Ncalc = 1.61
Optical Data:
Uniaxial (+), w=1.632, e=1.64, bire=0.0080.
Calculated Properties of Akermanite
Electron Density:
Bulk Density (Electron Density)=2.94 gm/cc note: Specific Gravity of Akermanite =2.94 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEAkermanite = 4.59 barns/electron U=PEAkermanite x rElectron Density= 13.48 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Akermanite is Not Radioactive
Akermanite Classification
Dana Class:
55.04.01.01(55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
Chemical Formula: 
