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Perloffite Mineral Data

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General Perloffite Information

Help on Chemical  Formula: Chemical Formula: Ba(Mn,Fe++)2Fe+++2(PO4)3(OH)3
Help on Composition: Composition: Molecular Weight = 680.92 gm
   Barium      18.15 %  Ba   20.27 % BaO
   Calcium      1.18 %  Ca    1.65 % CaO
   Magnesium    0.36 %  Mg    0.59 % MgO
   Manganese   11.30 %  Mn   14.58 % MnO
   Iron        19.68 %  Fe    4.22 % FeO / 23.45 % Fe2O3
   Phosphorus  13.65 %  P    31.27 % P2O5
   Hydrogen     0.44 %  H     3.97 % H2O
   Oxygen      35.24 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.9Ca0.2Mn2+1.4Fe2+0.4Mg0.1Fe3+2(PO4)3(OH)3
Help on Environment: Environment: Secondary mineral in a complex zoned granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Big Chief mine, one km south of Glendale, Pennington County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Louis Perloff (1907-), American lawyer and collector of microscopic minerals.
Help on Name Pronunciation: Name Pronunciation: Perloffite + Pronunciation Say PERLOFFITE

Perloffite Image

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Comments: Black, prismatic perloffite crystals on matrix.
Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Perloffite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7424:1:0.4021
Help on Cell Dimensions: Cell Dimensions: a = 9.223, b = 12.422, c = 4.995, Z = 2; beta = 100.39° V = 562.88 Den(Calc)= 4.02
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.166(1), 2.979(0.6), 3.104(0.53),

Physical Properties of Perloffite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Brownish black, Greenish brown, Dark brown, Black.
Help on Density: Density: 3.32
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Spear Head - Crystals are long, pointed and shaped like spearheads.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: greenish yellow

Optical Properties of Perloffite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.139 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1993,KPDmeas= 0.2414,KC= 0.2118
Ncalc = 1.7 - 1.85
Help on Optical Data: Optical Data: Biaxial (-), a=1.793, b=1.803, g=1.808, bire=0.0150, 2V(Calc)=70, 2V(Meas)=70-80. Dispersion r << v.
Help on Pleochroism (x): Pleochroism (x): dark greenish brown.
Help on Pleochroism (y): Pleochroism (y): light greenish brown.
Help on Pleochroism (z): Pleochroism (z): dark greenish brown.

Calculated Properties of Perloffite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Perloffite =4.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPerloffite = 87.05 barns/electron
U=PEPerloffite x rElectron Density= 329.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Perloffite is Not Radioactive

Perloffite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.09)where (A B)5 (XO4)3 Zq
  (41.09.01)Kulanite Group Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Penikisite BaMg2Al2(PO4)3(OH)3 P1 1 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.BH.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.20 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1
08.BH.20 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 21/m 2/m
08.BH.20 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 21/m 2/m

Other Perloffite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Perloffite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BH.20





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