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Basso R , Lucchetti G , Zefiro L , Palenzona A , Neues Jahrbuch fur Mineralogie, Monatshefte , 2000 (2000) p.373-384, Cerchiaraite, a new natural Ba-Mn-mixed-anion silicate chloride from, the Cerchiara mine, northern Apennines, Italy, Locality: Cerchiara mine, Va di Vara, northern Apennines, Italy
Physical Properties of Cerchiaraite
Cleavage:
None
Color:
Deep green.
Diaphaneity:
Transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
Streak:
pale green
Optical Properties of Cerchiaraite
Gladstone-Dale:
CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2013,KC= 0.1776 Ncalc = 1.67
Optical Data:
Uniaxial (+), w=1.745, e=1.765, bire=0.0200.
Calculated Properties of Cerchiaraite
Electron Density:
Bulk Density (Electron Density)=3.44 gm/cc note: Specific Gravity of Cerchiaraite =3.75 gm/cc.
Fermion Index:
Fermion Index = 0.07 Boson Index = 0.93
Photoelectric:
PECerchiaraite = 176.49 barns/electron U=PECerchiaraite x rElectron Density= 607.19 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cerchiaraite is Not Radioactive