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.

Name Pronunciation:

Rapidcreekite + Pronunciation

Synonym:

ICSD 82493

IMA1984-035

PDF 39-351

Rapidcreekite Image

Images:

Rapidcreekite

Comments: Colorless, radial-acicular crystals of rapidcreekite on matrix.
Location: Jeremias GlÃ¼ck 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 - Dipyramidal H-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),

Physical Properties of Rapidcreekite

Cleavage:

{010} Perfect, {100} Good

Color:

Colorless, White.

Density:

2.21

Diaphaneity:

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
Ncalc = 1.51 - 1.52

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:

Bulk Density (Electron Density)=2.30 gm/cc
note: Specific Gravity of Rapidcreekite =2.24 gm/cc.

Fermion Index:

Fermion Index = 0.0018375981
Boson Index = 0.9981624019

Photoelectric:

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

Radioactivity:

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

Rapidcreekite Classification

Dana Class:

32.02.01.01 (32)Compound Sulfates

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

(32.02.01)Dana Group

32.02.01.01 Rapidcreekite Ca2(SO4)(CO3)•4(H2O) Pcnb 2/m 2/m 2/m

Strunz Class:

07.DG.20 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3

07.DG.20 Rapidcreekite Ca2(SO4)(CO3)•4(H2O) Pcnb 2/m 2/m 2/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 - 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 Rapidcreekite Specimen Label here :

Rapidcreekite

Ca2(SO4)(CO3)•4(H2O)
Dana No: 32.02.01.01 Strunz No: 07.DG.20
Locality:

Notes:

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