Triplite Mineral Data

Triplite Mineral Data +

General Triplite Information

Chemical Formula:

(Mn,Fe++,Mg,Ca)2(PO4)(F,OH)

Composition:

Molecular Weight = 211.64 gm

Calcium 3.79 % Ca 5.30 % CaO

Magnesium 3.45 % Mg 5.71 % MgO

Manganese 25.96 % Mn 33.52 % MnO

Iron 13.19 % Fe 16.97 % FeO

Phosphorus 14.64 % P 33.53 % P₂O₅

Hydrogen 0.12 % H 1.06 % H₂O

Oxygen 32.13 % O

Fluorine 6.73 % F 6.73 % F

- % F -2.83 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Fe²⁺_0.5Mg_0.3Ca_0.2(PO₄)F_0.75(OH)_0.25

IMA Status:

Valid Species (Pre-IMA) 1813

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek triplos - "triplex."

Synonym:

ICSD 4428

PDF 25-1080

Triplite Image

Images:

Triplite

Comments: Dark brown vitreous triplite.
Location: Abravazes Pegmatite, Beira Alta, Viseu, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Triplite Crystallography

Axial Ratios:

a:b:c =1.8489:1:1.5162

Cell Dimensions:

a = 12.085, b = 6.536, c = 9.91, Z = 8; beta = 105.633° V = 753.81 Den(Calc)= 3.73

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 2.87(1), 3.05(0.9), 3.26(0.7),

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Forms: [ 2 1 1] [ 1 0 1] [ 0 1 0] [ 1 1 0] [ 0 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Rea J R , Kostiner E , Acta Crystallographica, Section B , 28 (1972) p.2525-2529, The crystal structure of manganese fluorophosphate, Mn2(PO4)F, Locality: synthetic

View Additional jPOWD Structure files for Triplite
[1]

Physical Properties of Triplite

Cleavage:

[010] Good, [100] Distinct

Color:

Brown, Dark brown, Salmon pink, Brownish black, Black.

Density:

3.44 - 3.9, Average = 3.67

Diaphaniety:

Subtranslucent to opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5 - Apatite

Luminescence:

None.

Luster:

Resinous - Greasy

Streak:

yellowish gray

Optical Properties of Triplite

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1778,KPDmeas= 0.1807,KC= 0.1886

Optical Data:

Biaxial (+), a=1.65, b=1.66, g=1.68, bire=0.0300, 2V(Calc)=72, 2V(Meas)=70-90. Dispersion relatively strong.

Calculated Properties of Triplite

Electron Density:

r_electron=3.52 gm/cc
note: r_Triplite=3.67 gm/cc.

Fermion Index

Fermion Index = 0.00644
Boson Index = 0.99356

Photoelectric:

PE_Triplite= 11.97 barns/electron
U=PE_Triplite x r_electron= 42.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Triplite is Not Radioactive

Triplite Classification

Dana Class:

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

(41.6)where (A)2 (XO4) Zq

(41.6.1)Dana Group

41.6.1.1 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

41.6.1.2 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

41.6.1.3 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

Strunz Class:

VII/B.03-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.03 - Wagnerite - Sarkinite series

VII/B.03-10 Wagnerite (Mg,Fe)2(PO4)F P 2₁/a 2/m

VII/B.03-20 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

VII/B.03-30 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

VII/B.03-40 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

VII/B.03-50 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-60 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-65 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

VII/B.03-70 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

Other Triplite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Triplite

(Mn,Fe++,Mg,Ca)2(PO4)(F,OH)
Dana No: 41.6.1.2 Strunz No: VII/B.03-40
Locality:

Notes: