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Rapidcreekite

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Formula:
Ca
 
2
(SO
 
4
)(CO
 
3
) · 4H
 
2
O
System:OrthorhombicColour:White, colourless.
Lustre:VitreousHardness:2
Name: Named after the Rapid Creek area, Yukon, the type locality.
This page provides mineralogical data about Rapidcreekite.

Classification of Rapidcreekite

IMA status:Approved
Strunz 8th edition ID:6/C.22-25
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:32.2.1.1

32 : COMPOUND SULFATES
2 : Hydrated Compound Sulfates
Hey's CIM Ref.:12.2.8

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

Type Locality:Rapid Creek, Dawson Mining District, Yukon Territory, Canada
Year of Discovery:1986

Physical Properties of Rapidcreekite

Lustre: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)

Optical Data of Rapidcreekite

Type:Biaxial (+)
RI values: nα = 1.516 nβ = 1.518 nγ = 1.531
2V:Measured: 45° , Calculated: 44°
Maximum Birefringence:δ = 0.015

Chart 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:
Ca
 
2
(SO
 
4
)(CO
 
3
) · 4H
 
2
O
Simplified for copy/paste:Ca2(SO4)(CO3)·4H2O
Essential elements:C, Ca, H, O, S
All elements listed in formula:C, Ca, H, O, S

Relationship of Rapidcreekite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DG.05Darapskite
Na
 
3
(SO
 
4
)(NO
 
3
) · H
 
2
O
7.DG.10Clinoungemachite
(Na, K, Fe, SO
 
4
)
7.DG.10Humberstonite
Na
 
7
K
 
3
Mg
 
2
(SO
 
4
)
 
6
(NO
 
3
)
 
2
· 6H
 
2
O
7.DG.10Ungemachite
K
 
3
Na
 
8
Fe(SO
 
4
)
 
6
(NO
 
3
)
 
2
· 6H
 
2
O
7.DG.15Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
7.DG.15Charlesite
Ca
 
6
(Al,Si)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH,O)
 
12
· 26H
 
2
O
7.DG.15Ettringite
Ca
 
6
Al
 
2
(SO
 
4
)
 
3
(OH)
 
12
· 26H
 
2
O
7.DG.15Jouravskite
Ca
 
6
Mn
3+
2
(SO
 
4
,CO
 
3
)
 
3
(OH)
 
12
· 26H
 
2
O
7.DG.15Sturmanite
Ca
 
6
(Fe
3+
 
,Al,Mn
3+
 
)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH)
 
12
· 25H
 
2
O
7.DG.15Thaumasite
Ca
 
3
(SO
 
4
)[Si(OH)
 
6
](CO
 
3
) · 12H
 
2
O
7.DG.15Carraraite
Ca
 
3
(SO
 
4
)[Ge(OH)
 
6
](CO
 
3
) · 12H
 
2
O
7.DG.15Buryatite
Ca
 
3
(Si,Fe,Al)(SO
 
4
)[B(OH)
 
4
]O(OH)
 
5
· 12H
 
2
O
7.DG.20Korkinoite
Ca
 
4
(SO
 
4
)
 
2
(CO
 
3
)
 
2
· 9(H
 
2
O)
7.DG.25Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
(OH)
 
4
Cl
 
4
· 7H
 
2
O
7.DG.30Nakauriite
Cu
 
8
(SO
 
4
)
 
4
(CO
 
3
)(OH)
 
6
· 48H
 
2
O
7.DG.35Chessexite
(Na,K)
 
4
Ca
 
2
(Mg,Zn)
 
3
Al
 
8
(SO
 
4
)
 
10
(SiO
 
4
)
 
2
· 40H
 
2
O
7.DG.40Carlosruizite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SeO
 
4
)
 
12
(IO
 
3
)
 
12
· 12H
 
2
O
7.DG.40Fuenzalidaite
K
 
6
(Na,K)
 
4
Na
 
6
Mg
 
10
(SO
 
4
)
 
12
(IO
 
3
)
 
12
· 12H
 
2
O
7.DG.45Chelyabinskite
(Ca,Mg)
 
3
(SO
 
4
,CO
 
3
)
 
2
[Si(OH)
 
6
] · 9H
 
2
O (?)
Related Minerals - Hey's Index Grouping:

- +
12.2.1Burkeite
Na
 
6
(CO
 
3
)(SO
 
4
)
 
2
12.2.2Hanksite
Na
 
22
K(SO
 
4
)
 
9
(CO
 
3
)
 
2
Cl
12.2.3Tychite
Na
 
6
Mg
 
2
(CO
 
3
)
 
4
(SO
 
4
)
12.2.4Motukoreaite
Mg
 
6
Al
 
3
(OH)
 
18
[Na(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
12.2.5Ferrotychite
Na
 
6
(Fe,Mn,Mg)
 
2
(CO
 
3
)
 
4
(SO
 
4
)
12.2.6Nakauriite
Cu
 
8
(SO
 
4
)
 
4
(CO
 
3
)(OH)
 
6
· 48H
 
2
O
12.2.7Carbonatecyanotrichite
Cu
 
4
Al
 
2
(CO
 
3
,SO
 
4
)(OH)
 
12
· 2H
 
2
O
12.2.9Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
(OH)
 
4
Cl
 
4
· 7H
 
2
O
12.2.10Schulenbergite
(Cu,Zn)
 
7
(SO
 
4
,CO
 
3
)
 
2
(OH)
 
10
· 3H
 
2
O
12.2.11Leadhillite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2
12.2.12Macphersonite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2
12.2.13Susannite
Pb
 
4
(CO
 
3
)
 
2
(SO
 
4
)(OH)
 
2
12.2.14Wherryite
Pb
 
7
Cu
 
2
(SO
 
4
)
 
4
(SiO
 
4
)
 
2
(OH)
 
2
12.2.15Caledonite
Pb
 
5
Cu
 
2
(SO
 
4
)
 
3
(CO
 
3
)(OH)
 
6
12.2.16Nasledovite
PbMn
 
3
Al
 
4
(CO
 
3
)
 
4
(SO
 
4
)O
 
5
· 5H
 
2
O
12.2.17Jouravskite
Ca
 
6
Mn
3+
2
(SO
 
4
,CO
 
3
)
 
3
(OH)
 
12
· 26H
 
2
O
12.2.18Schröckingerite
NaCa
 
3
(UO
 
2
)(CO
 
3
)
 
3
(SO
 
4
)F · 10H
 
2
O
12.2.19Manganotychite
Na
 
6
Mn
 
2
(CO
 
3
)
 
4
(SO
 
4
)
12.2.20Hauckite
Fe
3+
3
(Mg,Mn
2+
 
)
 
24
Zn
 
18
(SO
 
4
)
 
4
(CO
 
3
)
 
2
(OH)
 
81
12.2.21Paraotwayite
Ni(OH)
 
2-x
(SO
 
4
,CO
 
3
)
 
0.5x
12.2.22Carrboydite
[(Ni
 
1-x
Al
 
x
)(OH)
 
2
][SO
 
4
]
 
x/2
· nH
 
2
O
12.2.23Mountkeithite
[(Mg
 
1-x
Fe
3+
x
)(OH)
 
2
][SO
 
4
]
 
x/2
· nH
 
2
O
12.2.24Camerolaite
Cu
 
4
Al
 
2
(HSbO
 
4
,SO
 
4
)(CO
 
3
)(OH)
 
10
· 2H
 
2
O

Other Names for Rapidcreekite

Synonyms:
IMA1984-035
Other Languages:
German:Rapidcreekit
Russian:Рапидкрикит
Spanish:Rapidcreekita

Other Information

Health Warning: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.

Internet Links for Rapidcreekite

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  • Raman and XRD data at RRUFF project
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  • Rapidcreekite details from Handbook of Mineralogy (PDF)
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  • Localities for Rapidcreekite

    The 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. ? 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 Territory
      • 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
    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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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