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Scawtite

Big Photo

Christmas Mine (Red Bird shafts; Inspiration Mine; Hackberry shafts), Christmas, Christmas area, Banner District, Dripping Spring Mts, Gila Co., Arizona, USA
© Wm. Wise (2006)

Show Scawtite Photos (2)
Formula:
Ca
 
7
Si
 
6
(CO
 
3
)O
 
18
·2H
 
2
O
System:MonoclinicColour:Colourless
Hardness:4 - 5
Name:Named after its discovery locality.
This page provides mineralogical data about Scawtite.

Classification of Scawtite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/F.21-20
Nickel-Strunz 10th (pending) edition ID:9.CK.15

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 8th edition ID:64.2.1.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
2 : Rings with Other Anions and Insular Silicate Groups: 3-membered rings with other anion groups
Hey's CIM Ref.:17.4.4

17 : Silicates Containing other Anions
4 : Silicates with carbonates
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Type Occurrence of Scawtite

Type Locality:Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK
Year of Discovery:1929

Physical Properties of Scawtite

Lustre:Vitreous
Colour:Colourless
Hardness (Mohs):4 - 5

Crystallography of Scawtite

Crystal System:Monoclinic
Cell Parameters:a = 10.12Å, b = 15.18Å, c = 6.62Å
β = 100.55°
Ratio:a:b:c = 0.667 : 1 : 0.436
Unit Cell Volume:V 999.78 ų (Calculated from Unit Cell)

Optical Data of Scawtite

Type:Biaxial (+)
RI values: nα = 1.597 - 1.603 nβ = 1.606 - 1.609 nγ = 1.618 - 1.621
2V:Measured: 74° to 78°, Calculated: 72° to 84°
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v weak

Chemical Properties of Scawtite

Formula:
Ca
 
7
Si
 
6
(CO
 
3
)O
 
18
·2H
 
2
O
Essential elements:C, Ca, H, O, Si
All elements listed in formula:C, Ca, H, O, Si
Common Impurities:Ti,Al,Fe,Mn,Mg

Relationship of Scawtite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.CK.05Buergerite
[Na][Fe
3+
3
][Al
 
6
][O
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Chromdravite
[Na][Mg
 
3
][(Cr
3+
 
,Fe
3+
 
)
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Dravite
[Na][Mg
 
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Elbaite
[Na][(Li,Al)
 
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Feruvite
[Ca][(Fe
2+
 
 ,Mg)
 
3
][MgAl
 
5
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Foitite
[ ][Fe
2+
2
(Al,Fe
3+
 
)][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Liddicoatite
[Ca][Li
 
2
Al][Al
 
6
][(OH)
 
3
|F|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Olenite
([ ],Na)[(Al,Li)
 
3
][Al
 
6
][(O,OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Povondraite
[Na][Fe
3+
3
][Fe
3+
6
][O
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Schorl
[Na][Fe
2+
3
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Uvite
[Ca][(Mg,Fe
2+
 
)
 
3
][MgAl
 
5
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Magnesiofoitite
[ ][Mg
 
2
(Al,Fe
3+
 
 )][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Rossmanite
[ ][LiAl
 
2
][Al
 
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Vanadiumdravite
[Na][Mg
 
3
][V
3+
6
][(OH)
 
3
|OH|(BO
 
3
)
 
3
|Si
 
6
O
 
18
]
9.CK.05Oxy-Dravite
Na (MgAl
 
2
)(MgAl
 
5
)Si
 
6
O
 
18
(BO
 
3
)
 
3
(OH)
 
3
O
9.CK.05Oxy-rossmanite
[ ][LiAl
 
2
]Al
 
6
(BO
 
3
)
 
3
[Si
 
6
O
 
18
](OH)
 
3
(O)
9.CK.10Abenakiite-(Ce)
Na
 
26
Ce
 
6
[O|SO
 
2
|(CO
 
3
)
 
6
|(PO
 
4
)
 
6
|Si
 
6
O
 
18
]
9.CK.20Steenstrupine-(Ce)
Na
 
14
Mn
2+
2
(Fe
3+
 
,Mn
3+
 
)
 
2
Ce
 
6
(Zr,Th)[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
6
|(Si
 
6
O
 
18
)
 
2
]·2H
 
2
O
9.CK.20Thorosteenstrupine
CaMnThSi
 
4
O
 
11
(OH)F·6H
 
2
O
Related Minerals - Hey's Index Grouping:
17.4.1Tilleyite
Ca
 
5
[(CO
 
3
)
 
2
|Si
 
2
O
 
7
]
17.4.2Spurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
17.4.3Paraspurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
17.4.5Fukalite
Ca
 
4
[CO
 
3
|(HSiO
 
4
)
 
2
]
17.4.6Meionite
Ca
 
4
[CO
 
3
|(Al
 
2
Si
 
2
O
 
8
)
 
3
]
17.4.7Cancrinite
Na
 
6
Ca
 
2
[(CO
 
3
)
 
2
|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
17.4.8Carletonite
KNa
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F)·H
 
2
O
17.4.9Iimoriite-(Y)
Y
 
2
[CO
 
3
|SiO
 
4
]
17.4.10Kainosite-(Y)
Ca
 
2
(Y,Ce)
 
2
Si
 
4
O
 
12
CO
 
3
·H
 
2
O
17.4.11Caysichite-(Y)
Y
 
2
(Ca,Gd)
 
2
Si
 
4
O
 
10
(CO
 
3
)
 
3
·4H
 
2
O
17.4.12Lepersonnite-(Gd)
CaO(Gd,Dy)
 
2
O
 
3
·24UO
 
3
·8CO
 
2
·4SiO
 
2
·60H
 
2
O
17.4.13Ashburtonite
Pb
 
4
Cu
 
4
[(OH)
 
3
|Cl|(HCO
 
3
)
 
4
|Si
 
4
O
 
12
] · H
 
2
O
17.4.14Surite
Pb(Pb,Ca)(CO
 
3
)
 
2
(Al,Fe,Mg)
 
2
(Si,Al)
 
4
O
 
10
(OH)
 
2
17.4.15Tundrite-(Ce)
Na
 
3
(Ce,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH)·2H
 
2
O
17.4.16Tundrite-(Nd)
Na
 
3
(Nd,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH)·2H
 
2
O

Other Names for Scawtite

German names:
Scawtit
Russian names:
Скоутит
Spanish names:
Scawtita

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 Scawtite

Reference List:Tilley, C.E. and Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine: 22: 222-224.

McConnell, J. D. C. (1955), A chemical, optical, and X-ray study of scawtite from Ballycraigy, Larne, N. Ireland: American Mineralogist: 40: 510-514.

Murdoch, J. & McConnell, D. (1958), Crystal chemistry of scawtite: American Mineralogist: 43: 498-502.

Pluth, J.J. and Smith, J.V. (1973) The crystal structure of scawtite, Ca7(Si6O8)(CO3)·2H2O. Acta Crystallographica: B29: 73-80.

Zhang, L., Fu, P., Yang, H., Yu, K., and Zhou, Z. (1992) Crystal structure of scawtite. Chinese Sci. Bull.: 37: 930-934.

American Mineralogist (1994): 79: 391.

Grice, J.D. (2005) The structure of spurrite, tilleyite and scawtite, and relationships to other slicate-carbonate minerals. Canadian Mineralogist: 43: 1489-1500.

Internet Links for Scawtite

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    Localities for Scawtite

    Hide Locality List
    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.
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    (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.
    Australia
     
    • Tasmania
      • Huon district
        • Weld river
    		Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    Germany
     
    • Bavaria
      • Franconia
        • Maroldsweisach
    		J. Tron (1987): Scawtit von Maroldsweisach. LAPIS 12 (2), 30
    Indonesia
     
    MinRec 4:205
    Ireland
     
    • Co. Sligo
      • Killala Bay
    		Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Hiroshima prefecture
    		Kusachi et al (1971) Koubutsugaku Zasshi, 10, 296-304.
        • Okayama Prefecture
          • Takahashi
            • Bitchu-cho (Bicchu-cho)
      • Tohoku Region
        • Fukushima Prefecture
    		Matsuyama, F. (2001)
    New Zealand
     
    • North Island
      • Northland
        • Kaipara
    		Mason, B. (1957): Larnite, scawtite, and hydrogrossular from Tokatoka, New Zealand. American Mineralogist 42, 379-392.
    Norway
     
    • Telemark
      • Skien
    		Jamtveit B., Dahlgren S. and Austrheim H., (1997): "High-grade contact metamorphism of calcareous rocks from the Oslo Rift, Southern Norway".
    Romania
     
    • Hunedoara Co.
      • Hunedoara
    		Marincea, Ş., Bilal, E., Verkaeren, J., Pascal, M.-L., and Fonteilles, M. (2001) Superposed paragenesis in spurrite-, tilleyite- and gehlenite-bearing skarns from Cornet Hill, Apuseni Mountains, Romania. Canadian Mineralogist: 39: 1435-1453.
    UK
     
    • Northern Ireland
      • Co. Antrim
        • Glenoe
        • Larne
    USA
     
    • Arizona
      • Gila Co.
        • Dripping Spring Mts
          • Banner District
            • Christmas area
              • Christmas
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 362.
    • California
      • Riverside Co.
        • Crestmore
    		[micromounts@yahoogroups.com]; American Mineralogist: 51: 56-74
    Mineral and/or Locality
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