Monetite Mineral Data

General Monetite Information

Chemical Formula:

CaHPO4

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

Empirical Formula:

Ca(HPO₄)

Environment:

Coatings and cements resulting from guano-induced phosphatization of sedimentary rocks; a coating on phosphate minerals in granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

On Monito (Moneta), Mona, Los Monges, and Aruba Islands, West Indies, Caribbean Sea. Link to MinDat.org Location Data.

Name Origin:

Named for Moneta (now Monito) Island, which contains a notable occurrence.

Name Pronunciation:

Monetite

Synonym:

ICSD 917

PDF Sep-80

Monetite Image

Images:

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

Axial Ratios:

a:b:c =0.9857:1:0.95

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

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.96(1), 3.35(0.75), 3.37(0.7),

Physical Properties of Monetite

Cleavage:

{???} Indistinct, {???} Indistinct, {???} Indistinct

Color:

Colorless, White, Light yellow.

Density:

2.929

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Monetite

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

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

Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Monetite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.0006245555
Boson Index = 0.9993754445

Photoelectric:

PE_Monetite= 4.70 barns/electron
U=PE_Monetite x rElectron Density= 13.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Monetite is Not Radioactive

Monetite Classification

Dana Class:

37.01.01.01 (37)Anhydrous Acid Phosphates, etc

(37.01)with miscellaneous formulae

(37.01.01)Dana Group

37.01.01.01 Monetite CaHPO4 P1 1

37.01.01.02 Weilite CaHAsO4 P1 1

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Monetite Specimen Label here :

Monetite

CaHPO4
Dana No: 37.01.01.01 Strunz No: 08.AD.10
Locality:

Notes:

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