Monetite Mineral Data

Monetite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Link to MinDat.org Location Data.

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 - PinacoidalH-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),

Crystal Structure:

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Catti M , Ferraris G , Filhol A , Acta Crystallographica, Section B , 33 (1977) p.1223-1229, Hydrogen bonding in the crystalline state. CaHPO4 (monetite),, P-1 or P1? A novel neutron diffraction study, Locality: Synthetic

Physical Properties of Monetite

Cleavage:

[???] Indistinct, [???] Indistinct, [???] Indistinct

Color:

Colorless, White, Light yellow.

Density:

2.929

Diaphaniety:

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

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:

r_electron=2.93 gm/cc
note: r_Monetite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.00062
Boson Index = 0.99938

Photoelectric:

PE_Monetite= 4.70 barns/electron
U=PE_Monetite x r_electron= 13.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Monetite is Not Radioactive

Monetite Classification

Dana Class:

37.1.1.1 (37)Anhydrous Acid Phosphates, etc

(37.1)with miscellaneous formulae

(37.1.1)Dana Group

37.1.1.1 Monetite CaHPO4 P1 1

37.1.1.2 Weilite CaHAsO4 P1 1

Strunz Class:

VII/A.12-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.12 - Monetite - Schultenite series

VII/A.12-10 Monetite CaHPO4 P1 1

VII/A.12-20 Weilite CaHAsO4 P1 1

VII/A.12-30 Phosphammite (NH4)2HPO4 P 2₁/c 2/m

VII/A.12-40 Biphosphammite (NH4,K)H2PO4 I 42d 4 2m

VII/A.12-50 Archerite (K,NH4)H2PO4 I 42d 4 2m

VII/A.12-60 Olgite Na(Sr,Ba)PO4 P 3 3

VII/A.12-70 Bario-olgite! Na(Ba,Sr,Na,REE)PO4 P 3 3

Other Monetite Information

References:

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

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Monetite

CaHPO4
Dana No: 37.1.1.1 Strunz No: VII/A.12-10
Locality:

Notes: