Triploidite Mineral Data

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Triploidite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Triploidite :

B and L Fine Minerals
Dakota Matrix Minerals
Dan & Diana Weinrich Mineral Auctions
Excalibur Mineral Corp.
Exceptional Minerals
John Betts Fine Minerals
Mineral News
Mineral of the Month Club
NY/NJ Gem & Mineral Show
TIMA Mineral Analyzer
Weinrich Minerals, Inc.
Wright's Rock Shop

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: