Ardealite Mineral Data

Ardealite Mineral Data +

[Newest Minerals] [Minerals for Sale] [Tsumeb Mine] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa and Mastercard are Welcome

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.

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 - DomaticH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Sakae T , Nagata H , Sudo T , American Mineralogist , 63 (1978) p.520-527, The crystal structure of synthetic calcium phosphate - sulfate hydrate,, Ca2HPO4SO4.4H2O, and its relation to brushite and gypsum

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:

r_electron=2.37 gm/cc
note: r_Ardealite=2.32 gm/cc.

Fermion Index

Fermion Index = 0.00128
Boson Index = 0.99872

Photoelectric:

PE_Ardealite= 3.84 barns/electron
U=PE_Ardealite x r_electron= 9.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ardealite is Not Radioactive

Ardealite Classification

Dana Class:

43.1.1.1 (43)Compound Phosphates, etc.

(43.1)(Acid with Compound Anions.)

(43.1.1)Dana Group

43.1.1.1 Ardealite Ca2(SO4)(HPO4)·4(H2O) Cc m

Strunz Class:

VI/C.22-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. Cations of very big size

VI/C.22 - Bassanite - Ardealite series

VI/C.22-10 Bassanite 2CaSO4·(H2O) Unk Ortho

VI/C.22-20 Gypsum CaSO4·2(H2O) A2/a 2/m

VI/C.22-25 Rapidcreekite Ca2(SO4)(CO3)·4(H2O) Pcnb 2/m 2/m 2/m

VI/C.22-30 Ardealite Ca2(SO4)(HPO4)·4(H2O) Cc m

Other Ardealite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Dana8)

Search for Ardealite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Ardealite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Ardealite Mineral Data :

Ask about Ardealite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Ardealite

Ca2(SO4)(HPO4)·4(H2O)
Dana No: 43.1.1.1 Strunz No: VI/C.22-30
Locality:

Notes: