Occurs as a secondary mineral in vugs from the Gentil mine granitic pegmatite. Dufrenite group. Magnesium analog of burangaite.
IMA Status:
Approved IMA 2005 (Dana # Added)
Locality:
Gentil mine, Mendes Pimentel County, Minas Gerais, Brazil Link to MinDat.org Location Data.
Name Origin:
Named in honor of Paulo Anselmo Matioli (b.1975), mineral collector, founder, and curator of the Museu de Ciências Naturais Jobas "Jose Bonifácio de Andrada e Silva" Santos, SP, Bra zil.
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Atencio D , Coutinho J M V , Mascarenhas Y P , Ellena J A , American Mineralogist , 91 (2006) p.1932-1936, Matioliite, the Mg-analogue of burangaite, from Gentil mine, Mendes Pimentel,, Minas Gerais, Brazil, and other occurrences, Locality: Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, Sample: T = 120 K
Physical Properties of Matioliite
Cleavage:
{100} Perfect
Color:
Blue, Colorless.
Diaphaneity:
Transparent
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Matioliite
Gladstone-Dale:
CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1886,KC= 0.2071 Ncalc = 1.68
Optical Data:
Biaxial (-), a=1.597, b=1.627, g=1.632, bire=0.0350, 2V(Calc)=42, 2V(Meas)=43. Dispersion r > v.
Calculated Properties of Matioliite
Electron Density:
Bulk Density (Electron Density)=3.29 gm/cc note: Specific Gravity of Matioliite =3.28 gm/cc.
Fermion Index:
Fermion Index = 0.003371735 Boson Index = 0.996628265
Photoelectric:
PEMatioliite = 1.93 barns/electron U=PEMatioliite x rElectron Density= 6.35 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Matioliite is Not Radioactive
Matioliite Classification
Dana Class:
42.09.01.05(42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen