Rapidcreekite Mineral Data

Rapidcreekite Mineral Data +

General Rapidcreekite Information

Chemical Formula:

Ca2(SO4)(CO3)·4(H2O)

Composition:

Molecular Weight = 308.29 gm

Calcium 26.00 % Ca 36.38 % CaO

Hydrogen 2.62 % H 23.37 % H₂O

Carbon 3.90 % C 14.28 % CO₂

Sulfur 10.40 % S 25.97 % SO₃

Oxygen 57.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂(SO₄)(CO₃)·4(H₂O)

Environment:

Found in joint surfaces along a siderite iron formation.

IMA Status:

Approved IMA 1986

Locality:

Rapid Creek, Big Fish river area, Yukon Territories, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 82493

IMA1984-035

PDF 39-351

Rapidcreekite Image

Images:

Rapidcreekite

Comments: Colorless, radial-acicular crystals of rapidcreekite on matrix.
Location: Jeremias Gl?ck Mine (Fairy Grotto), Garnsdorf, Saalfeld, Thuringia, Germany. Scale: Picture size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Rapidcreekite Crystallography

Axial Ratios:

a:b:c =0.8076:1:0.321

Cell Dimensions:

a = 15.49, b = 19.18, c = 6.157, Z = 8; V = 1,829.23 Den(Calc)= 2.24

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcnb

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

By Intensity(I/I_o): 7.78(1), 3.11(0.8), 4.31(0.7),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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H - Help Screen
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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 34 (1996) p.99-106, The crystal structure of rapidcreekite, Ca2(SO4)(CO3)(H2O)4,, and its relation to the structure of gypsum

Physical Properties of Rapidcreekite

Cleavage:

[010] Perfect, [100] Good

Color:

Colorless, White.

Density:

2.21

Diaphaniety:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rapidcreekite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2329,KPDmeas= 0.236,KC= 0.232

Optical Data:

Biaxial (+), a=1.516, b=1.518, g=1.531, bire=0.0150, 2V(Calc)=44, 2V(Meas)=45.

Calculated Properties of Rapidcreekite

Electron Density:

r_electron=2.30 gm/cc
note: r_{Rapidcreekite}=2.24 gm/cc.

Fermion Index

Fermion Index = 0.00183
Boson Index = 0.99817

Photoelectric:

PE_{Rapidcreekite}= 3.86 barns/electron
U=PE_{Rapidcreekite} x r_electron= 8.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rapidcreekite is Not Radioactive

Rapidcreekite Classification

Dana Class:

32.2.1.1 (32)Compound Sulfates

(32.2)(hydrous) with simple bi-anionic formula

(32.2.1)Dana Group

32.2.1.1 Rapidcreekite Ca2(SO4)(CO3)·4(H2O) Pcnb 2/m 2/m 2/m

Strunz Class:

VI/C.22-25 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 Rapidcreekite Information

References:

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

See Also:

Links to other databases for Rapidcreekite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Rapidcreekite

Ca2(SO4)(CO3)·4(H2O)
Dana No: 32.2.1.1 Strunz No: VI/C.22-25
Locality:

Notes: