Monohydrocalcite Mineral Data

General Monohydrocalcite Information

Chemical Formula:

CaCO3•(H2O)

Composition:

Molecular Weight = 118.10 gm

Calcium 33.93 % Ca 47.48 % CaO

Hydrogen 1.71 % H 15.25 % H₂O

Carbon 10.17 % C 37.26 % CO₂

Oxygen 54.19 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca(CO₃)•(H₂O)

Environment:

Saline deposits in arid regions. Precipitates in the air scrubbers of air-conditioning plants.

IMA Status:

Approved IMA 1964

Locality:

Lake Issyk-Kul, Kirgizia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its calcite composition with one molecule of water.

Name Pronunciation:

Monohydrocalcite + Pronunciation

Synonym:

Hydrocalcite

ICSD 200820

PDF 29-306

Monohydrocalcite Image

Images:

Monohydrocalcite

Comments: Gray to pale blue, due to copper staining, botryoidal monohydrocalcite crust.
Location: 40' level, Saint Pierre Mine, Sainte-Marie-aux-Mines, Vosges Mountains, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Monohydrocalcite Crystallography

Axial Ratios:

a:c = 1:0.71673

Cell Dimensions:

a = 10.566, c = 7.573, Z = 9; V = 732.18 Den(Calc)= 2.41

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3₁12

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

By Intensity(I/I_o): 4.33(1), 3.08(0.8), 1.931(0.6),2.17(0.6), 2.83(0.5), 2.38(0.4), 2.28(0.4), 1.945(0.3),

Crystal Structure:

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Swainson I P , American Mineralogist , 93 (2008) p.1014-1018, The structure of monohydrocalcite and the phase composition of the, beachrock deposits of Lake Butler and Lake Fellmongery, South Australia, Locality: Lakes Butler and Fellmongery, Robe, South Australia

Physical Properties of Monohydrocalcite

Color:

Gray, Gray white, White, Light blue, Light green.

Density:

2.38

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Fluorescent, Short UV=vivid green, Long UV=green.

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Monohydrocalcite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KPDmeas= 0.2384,KC= 0.2302
Ncalc = 1.55

Optical Data:

Uniaxial (+), w=1.545, e=1.59, bire=0.0450.

Calculated Properties of Monohydrocalcite

Electron Density:

Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Monohydrocalcite =2.41 gm/cc.

Fermion Index:

Fermion Index = 0.0018394832
Boson Index = 0.9981605168

Photoelectric:

PE_{Monohydrocalcite}= 4.28 barns/electron
U=PE_{Monohydrocalcite} x rElectron Density= 10.47 barns/cc.

Radioactivity:

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

Monohydrocalcite Classification

Dana Class:

15.01.03.01 (15)Hydrated Carbonates

(15.01)where A+ (XO3) · x(H2O)

(15.01.03)Dana Group

15.01.03.01 Monohydrocalcite CaCO3•(H2O) P 3₁12 3 2

Strunz Class:

05.CB.20 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

05.CB -With large cations (alkali and alkali-earth carbonates)

05.CB.20 Monohydrocalcite CaCO3•(H2O) P 3₁12 3 2

Other Monohydrocalcite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8;Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Monohydrocalcite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Monohydrocalcite

CaCO3•(H2O)
Dana No: 15.01.03.01 Strunz No: 05.CB.20
Locality:

Notes: