Triploidite Mineral Data

General Triploidite Information

Chemical Formula:

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

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

Empirical Formula:

Mn²⁺_1.5Fe²⁺_0.5(PO₄)(OH)

Environment:

Hydrothermal alteration product of primary phosphates in complex zoned granite pegmatites. Forms a series with wolfeite.

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Branchville, Fairfield Co., Connecticut, USA. Link to MinDat.org Location Data.

Name Origin:

Named for triplite and the Greek for form, as it closely resembles that species.

Name Pronunciation:

Triploidite + Pronunciation

Synonym:

ICSD 18095

PDF 26-1240

Triploidite Image

Images:

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

Axial Ratios:

a:b:c =0.9314:1:0.7489

Cell Dimensions:

a = 12.366, b = 13.276, c = 9.943, Z = 16; beta = 108.23° V = 1,550.42 Den(Calc)= 3.81

Crystal System:

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

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

By Intensity(I/I_o): 2.94(1), 3.107(0.9), 3.221(0.7),

Crystal Structure:

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Waldrop L , Zeitschrift fur Kristallographie , 131 (1970) p.1-20, The crystal structure of triploidite and its relation to the structures, of other minerals of the triplite-triploidite group, Refinement with reflections for which I > 1.2Imin, this is the poorer refinement, Locality: Branchville, Connecticut, USA

View Additional jPOWD Structure files for Triploidite
[1]

Physical Properties of Triploidite

Cleavage:

{???} Perfect

Color:

Greenish, Yellow, Yellow brown, Pink, Reddish brown.

Density:

3.7

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Columnar - Forms columns

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Triploidite

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

Optical Data:

Biaxial (+), a=1.725, b=1.726, g=1.73, bire=0.0050

Calculated Properties of Triploidite

Electron Density:

Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Triploidite =3.70 gm/cc.

Fermion Index:

Fermion Index = 0.0028362647
Boson Index = 0.9971637353

Photoelectric:

PE_Triploidite= 14.05 barns/electron
U=PE_Triploidite x rElectron Density= 49.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Triploidite is Not Radioactive

Triploidite Classification

Dana Class:

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

(41.06)where (A)2 (XO4) Zq

(41.06.03)Wolfeite Group

41.06.03.01 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

41.06.03.02 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

41.06.03.03 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

41.06.03.04 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

41.06.03.06 Joosteite! (Mn,Mn,Fe)2(PO4)O I2/a 2/m

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

References:

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

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
15 - WWW-MINCRYST

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Ask about Triploidite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Triploidite

(Mn,Fe++)2(PO4)(OH)
Dana No: 41.06.03.02 Strunz No: 08.BB.15
Locality:

Notes: