Mineralogy Database

Monetite Mineral Data

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General Monetite Information

Help on Chemical  Formula: Chemical Formula: CaHPO4
Help on Composition: Composition: Molecular Weight = 136.06 gm
   Calcium     29.46 %  Ca   41.22 % CaO
   Phosphorus  22.77 %  P    52.16 % P2O5
   Hydrogen     0.74 %  H     6.62 % H2O
   Oxygen      47.04 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(HPO4)
Help on Environment: Environment: Coatings and cements resulting from guano-induced phosphatization of sedimentary rocks; a coating on phosphate minerals in granite pegmatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1882
Help on Locality: Locality: On Monito (Moneta), Mona, Los Monges, and Aruba Islands, West Indies, Caribbean Sea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Moneta (now Monito) Island, which contains a notable occurrence.
Help on Name Pronunciation: Name Pronunciation: Monetite Say MONETITE
Help on Synonym: Synonym: ICSD 917
  PDF Sep-80

Monetite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Monetite   Newberyite

Comments: Tan coatings of monetite on white newberyite pseudomorphous after struvite crystal.
Location: Mono Lake, Mono County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Monetite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9857:1:0.95
Help on Cell Dimensions: Cell Dimensions: a = 6.9, b = 7, c = 6.65, Z = 4; alpha = 96.35°, beta = 91.267°, gamma = 76.1° V = 309.80 Den(Calc)= 2.92
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1), 3.35(0.75), 3.37(0.7),

Physical Properties of Monetite

Help on Cleavage: Cleavage: {???} Indistinct, {???} Indistinct, {???} Indistinct
Help on Color: Color: Colorless, White, Light yellow.
Help on Density: Density: 2.929
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Monetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2104,KPDmeas= 0.2097,KC= 0.2045
Ncalc = 1.6
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.587-1.6, b=1.614, g=1.631-1.64, bire=0.0400-0.0440, 2V(Calc)=74, 2V(Meas)=70.

Calculated Properties of Monetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Monetite =2.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006245555
Boson Index = 0.9993754445
Help on Photoelectric: Photoelectric: PEMonetite = 4.70 barns/electron
U=PEMonetite x rElectron Density= 13.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Monetite is Not Radioactive

Monetite Classification

Help on  Dana Class: Dana Class: (37)Anhydrous Acid Phosphates, etc
  (37.01)with miscellaneous formulae
  (37.01.01)Dana Group Monetite CaHPO4 P1 1 Weilite CaHAsO4 P1 1
Help on  Strunz Class: Strunz Class: 08.AD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.10 Monetite CaHPO4 P1 1
08.AD.10 Weilite CaHAsO4 P1 1
08.AD.10 Svenekite! Ca(H2AsO4)2 P1 1

Other Monetite 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 Monetite :
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.AD.10





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