Perloffite Mineral Data

Perloffite Mineral Data +

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General Perloffite Information

Chemical Formula:

Ba(Mn,Fe++)2Fe+++2(PO4)3(OH)3

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

Empirical Formula:

Ba_0.9Ca_0.2Mn²⁺_1.4Fe²⁺_0.4Mg_0.1Fe³⁺₂(PO₄)₃(OH)₃

Environment:

Secondary mineral in a complex zoned granite pegmatite.

IMA Status:

Approved IMA 1977

Locality:

Big Chief mine, one km south of Glendale, Pennington County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Louis Perloff (1907-), American lawyer and collector of microscopic minerals.

Perloffite Image

Images:

Perloffite

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

Axial Ratios:

a:b:c =0.7424:1:0.4021

Cell Dimensions:

a = 9.223, b = 12.422, c = 4.995, Z = 2; beta = 100.39° V = 562.88 Den(Calc)= 4.02

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.166(1), 2.979(0.6), 3.104(0.53),

Physical Properties of Perloffite

Cleavage:

[100] Perfect

Color:

Brownish black, Greenish brown, Dark brown, Black.

Density:

3.32

Diaphaniety:

Transparent to Translucent

Habit:

Spear Head - Crystals are long, pointed and shaped like spearheads.

Hardness:

5 - Apatite

Luster:

Vitreous - Adamantine

Streak:

greenish yellow

Optical Properties of Perloffite

Gladstone-Dale:

CI meas= -0.184 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1993,KPDmeas= 0.2414,KC= 0.2039

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.

Pleochroism (x):

dark greenish brown.

Pleochroism (y):

light greenish brown.

Pleochroism (z):

dark greenish brown.

Calculated Properties of Perloffite

Electron Density:

r_electron=3.79 gm/cc
note: r_Perloffite=4.02 gm/cc.

Fermion Index

Fermion Index = 0.03706
Boson Index = 0.96294

Photoelectric:

PE_Perloffite= 87.05 barns/electron
U=PE_Perloffite x r_electron= 329.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Perloffite is Not Radioactive

Perloffite Classification

Dana Class:

41.9.1.4 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.9)where (A B)5 (XO4)3 Zq

(41.9.1)Dana Group

41.9.1.1 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.2 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

41.9.1.3 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.4 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

41.9.1.5 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

Strunz Class:

VII/B.29-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.29 - Bjarebyite group

VII/B.29-10 Penikisite BaMg2Al2(PO4)3(OH)3 P1 1

VII/B.29-20 Kulanite Ba(Fe,Mn,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-30 Bjarebyite (Ba,Sr)(Mn,Fe,Mg)2Al2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-35 Johntomaite! Ba(Fe,Ca,Mn)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-40 Perloffite Ba(Mn,Fe)2Fe2(PO4)3(OH)3 P 2₁/m 2/m

VII/B.29-50 Jagowerite BaAl2(PO4)2(OH)2 P1 1

VII/B.29-60 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

VII/B.29-70 Drugmanite Pb2(Fe,Al)H(PO4)2(OH)2 P 2₁/a 2/m

VII/B.29-80 Mounanaite PbFe2(VO4)2(OH)2 P1 1

Other Perloffite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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Print or Cut-and-Paste your Perloffite Specimen Label here :

Perloffite

Ba(Mn,Fe++)2Fe+++2(PO4)3(OH)3
Dana No: 41.9.1.4 Strunz No: VII/B.29-40
Locality:

Notes: