Ardealite Mineral Data

General Ardealite Information

Chemical Formula:

Ca2(SO4)(HPO4)•4(H2O)

Composition:

Molecular Weight = 344.26 gm

Calcium 23.28 % Ca 32.58 % CaO

Phosphorus 9.00 % P 20.62 % P₂O₅

Hydrogen 2.64 % H 23.55 % H₂O

Sulfur 9.31 % S 23.26 % SO₃

Oxygen 55.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂(SO₄)(HPO₄)•4(H₂O)

Environment:

In limestone caves, as an early stage of the breakdown of bat guano, in reaction with calcite.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

From the Cioclovina Cave, Transylvania, Romania. In Italy, in the La Guangola Cave, near Altamura, Apulia. At the Magurata and Bacho Kuo Caves, Bulgaria. Link to MinDat.org Location Data.

Name Origin:

From "Ardeal," the old Romanian name for Transylvania.

Name Pronunciation:

Ardealite + Pronunciation

Synonym:

ICSD 100626

PDF 41-585

Ardealite Image

Images:

Ardealite

Comments: Ardealite powder.
Location: Moorba Cave, Jurien Bay, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ardealite Crystallography

Axial Ratios:

a:b:c =0.1848:1:0.2024

Cell Dimensions:

a = 5.721, b = 30.95, c = 6.265, Z = 4; beta = 117.26° V = 986.11 Den(Calc)= 2.32

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 7.74(1), 3.93(0.5), 3.34(0.45),

Physical Properties of Ardealite

Color:

Light yellow, Brown.

Density:

2.3

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Hardness:

1-1.5 - Talc or a little harder

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Ardealite

Optical Data:

NCalc= 1.53 - from Gladstone-Dale relationship (KC = 0.2274) where Ncalc=Dcalc*KC+1
NCalc= 1.52 - from Gladstone-Dale relationship (KC = 0.2274) where Ncalc=Dmeas*KC+1

Calculated Properties of Ardealite

Electron Density:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Ardealite =2.32 gm/cc.

Fermion Index:

Fermion Index = 0.0012845606
Boson Index = 0.9987154394

Photoelectric:

PE_Ardealite= 3.84 barns/electron
U=PE_Ardealite x rElectron Density= 9.11 barns/cc.

Radioactivity:

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

Ardealite Classification

Dana Class:

43.01.01.01 (43)Compound Phosphates, etc.

(43.01)(Acid with Compound Anions.)

(43.01.01)Dana Group

43.01.01.01 Ardealite Ca2(SO4)(HPO4)•4(H2O) Cc m

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 Ardealite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Ardealite :
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 Ardealite Specimen Label here :

Ardealite

Ca2(SO4)(HPO4)•4(H2O)
Dana No: 43.01.01.01 Strunz No: 08.CJ.50
Locality:

Notes:

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