Mineralogy Database

Brushite Mineral Data

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General Brushite Information

Help on Chemical  Formula: Chemical Formula: CaHPO4•2(H2O)
Help on Composition: Composition: Molecular Weight = 172.09 gm
   Calcium     23.29 %  Ca   32.59 % CaO
   Phosphorus  18.00 %  P    41.24 % P2O5
   Hydrogen     2.93 %  H    26.17 % H2O
   Oxygen      55.78 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(HPO4)•2(H2O)
Help on Environment: Environment: One of the most common cave minerals, in guano deposits, and in phosphorites, formed at low pH by reaction of phosphate-rich solutions with calcite and clay.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: Found on Aves Island, Venezuela, west of Dominica, in the Caribbean Sea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Professor George Jarvis Brush (1831-1912), American mineralogist, Yale University, New Haven, Connecticut, USA.
Help on Name Pronunciation: Name Pronunciation: Brushite Say BRUSHITE
Help on Synonym: Synonym: ICSD 16132
  PDF 11-293

Brushite Image

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Comments: Tan coatings of brushite on calcite.
Location: Oberschleme, Erzgebirge Mountains, Sachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brushite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3881:1:0.4204
Help on Cell Dimensions: Cell Dimensions: a = 5.88, b = 15.15, c = 6.37, Z = 4; beta = 117.467° V = 503.49 Den(Calc)= 2.27
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.62(1), 3.8(0.3), 1.9(0.1),

Physical Properties of Brushite

Help on Cleavage: Cleavage: {010} Perfect, {001} Perfect
Help on Color: Color: Colorless, Yellow, Yellowish white, White.
Help on Density: Density: 2.328
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Brushite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2402,KPDmeas= 0.2342,KC= 0.2329
Ncalc = 1.53 - 1.54
Help on Optical Data: Optical Data: Biaxial (+), a=1.539, b=1.546, g=1.551, bire=0.0120, 2V(Calc)=80, 2V(Meas)=86.

Calculated Properties of Brushite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.38 gm/cc
note: Specific Gravity of Brushite =2.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0005865581
Boson Index = 0.9994134419
Help on Photoelectric: Photoelectric: PEBrushite = 3.72 barns/electron
U=PEBrushite x rElectron Density= 8.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brushite is Not Radioactive

Brushite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.01)A+ [HXO4] � x(H2O)
  (39.01.01)Dana Group Brushite CaHPO4•2(H2O) I2/a 2/m Pharmacolite CaHAsO4•2(H2O) Ia m
Help on  Strunz Class: Strunz Class: 08.CJ.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CJ -With only large cations
08.CJ.50 Ardealite Ca2(SO4)(HPO4)•4(H2O) Cc m
08.CJ.50 Brushite CaHPO4•2(H2O) I2/a 2/m
08.CJ.50 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono
08.CJ.50 Churchite-(Nd)! Nd(PO4)•2(H2O) Mono
08.CJ.50 Churchite-(Y) YPO4•2(H2O) A2/a,Aa Mono
08.CJ.50 Pharmacolite CaHAsO4•2(H2O) Ia m

Other Brushite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Brushite :
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

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Dana No: Strunz No: 08.CJ.50





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