Mineralogy Database

Triploidite Mineral Data

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General Triploidite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Fe++)2(PO4)(OH)
Help on Composition: Composition: Molecular Weight = 222.31 gm
   Manganese   37.07 %  Mn   47.86 % MnO
   Iron        12.56 %  Fe   16.16 % FeO
   Phosphorus  13.93 %  P    31.93 % P2O5
   Hydrogen     0.45 %  H     4.05 % H2O
   Oxygen      35.98 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+1.5Fe2+0.5(PO4)(OH)
Help on Environment: Environment: Hydrothermal alteration product of primary phosphates in complex zoned granite pegmatites. Forms a series with wolfeite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: Branchville, Fairfield Co., Connecticut, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for triplite and the Greek for form, as it closely resembles that species.
Help on Name Pronunciation: Name Pronunciation: Triploidite + Pronunciation Say TRIPLOIDITE
Help on Synonym: Synonym: ICSD 18095
  PDF 26-1240

Triploidite Image

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  Triploidite   Lithiophilite

Comments: Salmon-colored prismatic crystalline triploidite with brown lithiophilite.
Location: Capoeira Mine, near Parelhas, Rio Grande do Norte, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Triploidite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9314:1:0.7489
Help on Cell Dimensions: Cell Dimensions: a = 12.366, b = 13.276, c = 9.943, Z = 16; beta = 108.23° V = 1,550.42 Den(Calc)= 3.81
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.94(1), 3.107(0.9), 3.221(0.7),

Physical Properties of Triploidite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Greenish, Yellow, Yellow brown, Pink, Reddish brown.
Help on Density: Density: 3.7
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Triploidite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.1965,KC= 0.1969
Ncalc = 1.73 - 1.75
Help on Optical Data: Optical Data: Biaxial (+), a=1.725, b=1.726, g=1.73, bire=0.0050

Calculated Properties of Triploidite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Triploidite =3.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0028362647
Boson Index = 0.9971637353
Help on Photoelectric: Photoelectric: PETriploidite = 14.05 barns/electron
U=PETriploidite x rElectron Density= 49.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Triploidite is Not Radioactive

Triploidite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.06)where (A)2 (XO4) Zq
  (41.06.03)Wolfeite Group Wolfeite (Fe,Mn)2(PO4)(OH) P 21/a 2/m Triploidite (Mn,Fe)2(PO4)(OH) P 21/a 2/m Sarkinite Mn2(AsO4)(OH) P 21/a 2/m Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 21/a 2/m Joosteite! (Mn,Mn,Fe)2(PO4)O I2/a 2/m
Help on  Strunz Class: Strunz Class: 08.BB.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
08.BB.15 Sarkinite Mn2(AsO4)(OH) P 21/a 2/m
08.BB.15 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 21/a 2/m
08.BB.15 Triploidite (Mn,Fe)2(PO4)(OH) P 21/a 2/m
08.BB.15 Wagnerite (Mg,Fe)2(PO4)F P 21/a 2/m
08.BB.15 Wolfeite (Fe,Mn)2(PO4)(OH) P 21/a 2/m
08.BB.15 Joosteite! (Mn,Mn,Fe)2(PO4)O I2/a 2/m

Other Triploidite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Triploidite :
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.BB.15





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