Serrabrancaite Mineral Data

Serrabrancaite Mineral Data

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General Serrabrancaite Information

Chemical Formula:

MnPO4·(H2O)

Composition:

Molecular Weight = 164.70 gm

Manganese 32.69 % Mn 46.97 % Mn₂O₃

Phosphorus 18.81 % P 43.09 % P₂O₅

Hydrogen 1.10 % H 9.84 % H₂O

Oxygen 47.40 % O

______ ______

100.00 % 99.90 % = TOTAL OXIDE

Empirical Formula:

Mn³⁺_0.98PO_3.98·0.9(H₂O)

Environment:

Alteration product of triplite in a phosphate-bearing pegmatite. Related to the kieserite group

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Alto Serra Branca pegmatite, ~10 km southwest of Pedra Lavrand, Paraiba, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA1998-006

Serrabrancaite Image

Images:

Serrabrancaite

Comments: SEM micrograph of dark brown to dark greenish black isometric crystals of serrabrancaite up to 0.3 mm size. (AmMin, 85:848).
Location: Alto Serra Branca pegmatite near Pedra Lavrada, Paraiba, Brazil. Scale: See Image.
© American Mineralogist

Serrabrancaite Crystallography

Axial Ratios:

a:b:c =0.9258:1:0.986

Cell Dimensions:

a = 6.914, b = 7.468, c = 7.364, Z = 4; beta = 112.29° V = 351.82 Den(Calc)= 3.11

Crystal System:

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

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

By Intensity(I/I_o): 3.503(1)(100,111), 2.516(0.19)(022), 4.633(0.15)(111),2.104(0.12)(221), 4.856(0.12)(110), 2.957(0.1)(202), 3.271(0.1)(021),

Physical Properties of Serrabrancaite

Cleavage:

None

Color:

Dark brown, Dark greenish black.

Density:

3.17

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

olive green

Optical Properties of Serrabrancaite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2508,KPDmeas= 0.2461,KC= 0.2537

Optical Data:

Biaxial (?), a=1.75, b=1.79, g=1.8, bire=0.0500

Calculated Properties of Serrabrancaite

Electron Density:

r_electron=3.03 gm/cc
note: r_{Serrabrancaite}=3.11 gm/cc.

Fermion Index

Fermion Index = 0.00022
Boson Index = 0.99978

Photoelectric:

PE_{Serrabrancaite}= 9.23 barns/electron
U=PE_{Serrabrancaite} x r_electron= 28.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Serrabrancaite is Not Radioactive

Serrabrancaite Classification

Dana Class:

40.4.10.1 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.10)Phosphate analog of Kieserite (SO4) group (C2/c)

40.4.10.1 Serrabrancaite ! MnPO4·(H2O) C 2/c 2/m

Strunz Class:

VII/C.07-05 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.07 - Schubnelite - Warikahnite series

VII/C.07-05 Serrabrancaite MnPO4·(H2O) C 2/c 2/m

VII/C.07-10 Schubnelite Fe(VO4)(H2O) P1 1

VII/C.07-20 Fervanite Fe4(VO4)4·5(H2O) Unk. Mono

VII/C.07-30 Kolovratite HydrousvanadateofNiandZn ? Mono

VII/C.07-40 Warikahnite Zn3(AsO4)2·2(H2O) P1 1

Other Serrabrancaite Information

References:

NAME( AmMin, Vol 85, p 847) PHYS. PROP.(AmMin, Vol 85, p 847) OPTIC PROP.(AmMin, Vol 85, p 847)

See Also:

Links to other databases for Serrabrancaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Serrabrancaite

MnPO4·(H2O)
Dana No: 40.4.10.1 Strunz No: VII/C.07-05
Locality:

Notes: