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Rapidcreekite

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Formula:
Ca2(SO4)(CO3) · 4H2O
System:
Orthorhombic
Colour:
White, colourless.
Lustre:
Vitreous
Hardness:
2
Name:
Named after the Rapid Creek area, Yukon, the type locality.
This page provides mineralogical data about Rapidcreekite.

Classification of Rapidcreekite

Approved
7.DG.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
32.2.1.1

32 : COMPOUND SULFATES
2 : Hydrated Compound Sulfates
12.2.8

12 : Carbonates with other anions
2 : Carbonates with sulphate
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Type Occurrence of Rapidcreekite

Physical Properties of Rapidcreekite

Vitreous
Colour:
White, colourless.
Hardness (Mohs):
2

Crystallography of Rapidcreekite

Crystal System:
Orthorhombic
Cell Parameters:
a = 15.49Å, b = 19.18Å, c = 6.15Å
Ratio:
a:b:c = 0.808 : 1 : 0.321
Unit Cell Volume:
V 1,827.15 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.78 (100)
3.11 (80)
4.31 (70)
3.88 (70)
2.797 (60)
2.917 (50)
2.555 (50)

Optical Data of Rapidcreekite

Type:
Biaxial (+)
RI values:
nα = 1.516 nβ = 1.518 nγ = 1.531
2V:
Measured: 45° , Calculated: 44°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none

Chemical Properties of Rapidcreekite

Formula:
Ca2(SO4)(CO3) · 4H2O
All elements listed in formula:
Analytical Data:
Electron microprobe, CO2 and H2O by TGA-EGA
SO3 26.1
CO2 14.0
CaO 36.3
H2O 23.6

total 100.0
Empirical Formula:
Ca1.99(SO4)1.00(CO3)0.98•4.02H2O

Relationship of Rapidcreekite to other Species

7.DG.05DarapskiteNa3(SO4)(NO3) · H2O
7.DG.10Clinoungemachite(Na, K, Fe, SO4)
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2O
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
7.DG.15JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2O
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2O
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2O
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)
12.2.1BurkeiteNa6(CO3)(SO4)2
12.2.2HanksiteNa22K(SO4)9(CO3)2Cl
12.2.3TychiteNa6Mg2(CO3)4(SO4)
12.2.4MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
12.2.5FerrotychiteNa6(Fe,Mn,Mg)2(CO3)4(SO4)
12.2.6NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2O
12.2.7CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2O
12.2.9TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
12.2.10Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
12.2.11LeadhillitePb4(CO3)2(SO4)(OH)2
12.2.12MacphersonitePb4(CO3)2(SO4)(OH)2
12.2.13SusannitePb4(CO3)2(SO4)(OH)2
12.2.14WherryitePb7Cu2(SO4)4(SiO4)2(OH)2
12.2.15CaledonitePb5Cu2(SO4)3(CO3)(OH)6
12.2.16NasledovitePbMn3Al4(CO3)4(SO4)O5 · 5H2O
12.2.17JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2O
12.2.18SchröckingeriteNaCa3(UO2)(CO3)3(SO4)F · 10H2O
12.2.19ManganotychiteNa6Mn2(CO3)4(SO4)
12.2.20HauckiteFe33+(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81
12.2.21ParaotwayiteNi(OH)2-x(SO4,CO3)0.5x
12.2.22Carrboydite[(Ni1-xAlx)(OH)2][SO4]x/2 · nH2O
12.2.23Mountkeithite[(Mg1-xFex3+)(OH)2][SO4]x/2 · nH2O
12.2.24CamérolaiteCu6Al3(OH)18(H2O)2[Sb(OH)6](SO4)

Other Names for Rapidcreekite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rapidcreekite

Reference List:
ROBERTS, A.C., ANSELL, H.G., JONASSON, I.R., GRICE, J.D. & RAMIK, R.A. (1986): Rapidcreekite, a new hydrated calcium sulfate-carbonate from the Rapid Creek area, Yukon Territory. Canadian Mineralogist 24, 51-54.

ROBINSON, G.W., VAN VELTHUIZEN, J., ANSELL, H.G. & STURMAN, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area Yukon Territory. Mineralogical Record 23, 1-47.

COOPER, M.A. & HAWTHORNE, F.C. (1996): The crystal structure of rapidcreekite, Ca2(SO4)(CO3)$4H2O, and its relation to the structure of gypsum. Canadian Mineralogist 34, 99-106

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for Rapidcreekite

Localities for Rapidcreekite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Yukon
    • Dawson Mining District
MinRec 23:4-47
ROBERTS, A.C., ANSELL, H.G., JONASSON, I.R., GRICE, J.D. & RAMIK, R.A. (1986): Rapidcreekite, a new hydrated calcium sulfate-carbonate from the Rapid Creek area, Yukon Territory. Canadian Mineralogist 24, 51-54. ROBINSON, G.W., VAN VELTHUIZEN, J., ANSELL, H.G. & STURMAN, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area Yukon Territory. Mineralogical Record 23, 1-47. COOPER, M.A. & HAWTHORNE, F.C. (1996): The crystal structure of rapidcreekite, Ca2(SO4)(CO3)$4H2O, and its relation to the structure of gypsum. Canadian Mineralogist 34, 99-106.
        • Kulan Camp (Area A; Area 1)
Robinson, G.W., Van Velthuizen, J., Ansell, H.G. & Sturman, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area, Yukon Territory. Mineralogical Record 23, 1-47
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Beroun (Beraun)
Žák K., Skála R., Filippi M., Plášil J. (2010): Ikait - málo známý minerál zaledněných jeskyní: výskyt v občasném sezónním zalednění jeskyně Koda (Český kras). Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze 18, 109-115.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Burgfelsen
American Mineralogist: 76: 2021.
  • Thuringia
    • Saalfeld
      • Garnsdorf
Rüger, F.; Senf, L. & Witzke, T. (1995): Die Saalfelder Feengrotten: Seltene Sekundärmineralien aus Thüringen.- Lapis 20, 1, 15-26
Norway
 
  • Buskerud
    • Kongsberg
      • Kongsberg Silver Mining District
        • Overberget Mining Field
Raade,G. (1989): "Etter Neumann". NAGS-nytt 16(2), 49
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Legnica
      • Lubin District
        • Lubin
Material analysed by University of Silesia
  • Upper Silesia (Śląskie)
Warchulski, R., Gawęda, A., Szopa, K. (2014): Secondary phases from the Zn-Pb smelting slags from Katowice – Piekary Śląskie area, Upper Silesia, Poland: a SEM – XRD overview. Mineralogia Special Papers: 42: 110-111
Romania
 
  • Caraş-Severin Co.
    • Cerna valley
Onac, B. P. (2009): ACTA CARSOLOGICA 38/1, 27-39; Onac, B.P. & Effenberger, H.S. (2010): Rapidcreekite, Ca2(SO4)(CO3)•4H2O, in the H2S-rich environment of Diana Cave (Romania). 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 470.
Mineral and/or Locality  
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