Mineralogy Database

Serrabrancaite Mineral Data

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General Serrabrancaite Information

Help on Chemical  Formula: Chemical Formula: MnPO4•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn3+0.98PO3.98•0.9(H2O)
Help on Environment: Environment: Alteration product of triplite in a phosphate-bearing pegmatite. Related to the kieserite group
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Alto Serra Branca pegmatite, ~10 km southwest of Pedra Lavrand, Paraiba, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA1998-006

Serrabrancaite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9258:1:0.986
Help on Cell Dimensions: Cell Dimensions: a = 6.914, b = 7.468, c = 7.364, Z = 4; beta = 112.29° V = 351.82 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark brown, Dark greenish black.
Help on Density: Density: 3.17
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Adamantine
Help on Streak: Streak: olive green

Optical Properties of Serrabrancaite

Help on Gladstone-Dale: 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
Ncalc = 1.79 - 1.8
Help on Optical Data: Optical Data: Biaxial (?), a=1.75, b=1.79, g=1.8, bire=0.0500

Calculated Properties of Serrabrancaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Serrabrancaite =3.11 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002291932
Boson Index = 0.9997708068
Help on Photoelectric: Photoelectric: PESerrabrancaite = 9.23 barns/electron
U=PESerrabrancaite x rElectron Density= 28.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Serrabrancaite is Not Radioactive

Serrabrancaite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.10)Phosphate analog of Kieserite (SO4) group (C2/c) Serrabrancaite! MnPO4•(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.CB.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CB -With only medium-sized cations, RO4:H2O = 1:1
08.CB.05 Serrabrancaite! MnPO4•(H2O) C 2/c 2/m

Other Serrabrancaite Information

Help on References: References: NAME( AmMin, Vol 85, p 847) PHYS. PROP.(AmMin, Vol 85, p 847) OPTIC PROP.(AmMin, Vol 85, p 847)
Help on See Also: See Also: Links to other databases for Serrabrancaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 08.CB.05





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