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Scawtite

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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 (8)



Formula:
Ca
 
7
(Si
 
3
O
 
9
)
 
2
CO
 
3
 · 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
 
3
O
 
9
)
 
2
CO
 
3
 · 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.Fluor-schorl
Na(Fe
2+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
9.CK.05Buergerite
Na(Fe
3+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
O
 
3
F
9.CK.05Chromdravite
Na(Mg
 
3
)Cr
3+
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Dravite
Na(Mg
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Elbaite
Na(Li
 
1.5
Al
 
1.5
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Feruvite
Ca(Fe
2+
 
)
 
3
MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Foitite
(□,Na)(Fe
2+
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
OH
9.CK.05Liddicoatite
Ca(Li
 
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Olenite
Na(Al
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
O
 
3
(OH)
9.CK.05Povondraite
Na(Fe
3+
3
)Mg
 
2
Fe
3+
4
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
9.CK.05Schorl
Na(Fe
2+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Uvite
Ca(Mg
 
3
)MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Magnesiofoitite
(□,Na)(Mg
 
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Rossmanite
☐(LiAl
 
2
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
9.CK.05Vanadiumdravite
Na(Mg,Fe
2+
 
)
 
3
(V
3+
 
,Cr
3+
 
,Al)
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
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
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
9.CK.05Chromo-aluminopovondraite
Na(Cr
 
3
)Mg
 
2
Al
 
4
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
9.CK.05Fluor-dravite
Na(Mg
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
9.CK.10Abenakiite-(Ce)
Na
 
26
Ce
 
6
(Si
 
6
O
 
18
)(PO
 
4
)
 
6
(CO
 
3
)
 
6
(SO
 
2
)O
9.CK.20Steenstrupine-(Ce)
Na
 
14
Mn
2+
2
(Fe
3+
 
,Mn
3+
 
)
 
2
Ce
 
6
(Zr,Th)(Si
 
6
O
 
18
)
 
2
(PO
 
4
)
 
6
(HPO
 
4
)(OH)
 
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
(Si
 
2
O
 
7
)(CO
 
3
)
 
2
17.4.2Spurrite
Ca
 
5
(SiO
 
4
)
 
2
(CO
 
3
)
17.4.3Paraspurrite
17.4.5Fukalite
Ca
 
4
[Si
 
2
O
 
6
][CO
 
3
](OH)
 
2
17.4.6Meionite
Ca
 
4
Al
 
6
Si
 
6
O
 
24
CO
 
3
17.4.7Cancrinite
(Na,Ca,☐)
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
,SO
 
4
)
 
2
 · 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
[SiO
 
4
][CO
 
3
]
17.4.10Kainosite-(Y)
Ca
 
2
(Y,Ce)
 
2
(Si
 
4
O
 
12
)(CO
 
3
) · H
 
2
O
17.4.11Caysichite-(Y)
Ca
 
2
Y
 
2
Si
 
4
O
 
10
(CO
 
3
)
 
3
 · 4H
 
2
O
17.4.12Lepersonnite-(Gd)
Ca(Gd,Dy)
 
2
(UO
 
2
)
 
24
(SiO
 
4
)
 
4
(CO
 
3
)
 
8
(OH)
 
24
 · 48H
 
2
O
17.4.13Ashburtonite
Pb
 
4
Cu
 
4
(Si
 
4
O
 
12
)(HCO
 
3
)
 
4
(OH)
 
3
Cl · H
 
2
O
17.4.14Surite
(Pb,Ca)
 
3
(Al,Fe
2+
 
,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(CO
 
3
)
 
2
(OH)
 
2
17.4.15Tundrite-(Ce)
Na
 
2
Ce
 
2
Ti(SiO
 
4
)(CO
 
3
)
 
2
O
 
2
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

Other Languages:
German:Scawtit
Russian:Скоутит
Simplified Chinese:片柱钙石
Spanish: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

    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.
    Hide Locality List
    (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
    China
     
    • Anhui Province
      • Huaibei Prefecture
        • Suixi Co.
    		Liming Zhang, Pingqiu Fu, and Hexiong Yang (1991): Acta Mineralogica Sinica 11(3), 209-213
    • Hebei Province
      • Handan Prefecture
        • She Co.
    		Cao Zhengmin, Bi Yurun, and Wang Peiying (1987): Acta Petrologica et Mineralogica 6(2)
    Germany
     
    • Bavaria
      • Franconia
        • Maroldsweisach
    		J. Tron (1987): Scawtit von Maroldsweisach. LAPIS 12 (2), 30
    Hungary
     
    • Veszprém Co.
      • Balaton Uplands
        • Bakony Mts.
          • Sümegprága
    		Kónya-MÁFI,2008
    Indonesia
     
    MinRec 4:205
    Ireland
     
    • Co. Sligo
      • Killala Bay
    		Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
    Italy
     
    • Veneto
      • Vicenza Province
        • Altissimo
          • Del Tesoro Mt.
    		Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
        • Astico Valley
    		Collections Alessandro Mattiello and Padua University
        • Cornedo Vicentino
          • Spagnago
    		Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
    Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Hiroshima prefecture
          • Hiba-gun
    		Kusachi et al (1971) Koubutsugaku Zasshi, 10, 296-304.
        • Okayama Prefecture
          • Takahashi City
            • Bitchu-cho (Bicchu-cho)
    		Mineralogical Journal Vol. 14 (1989) , No. 7 pp 299-302
      • 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. American Mineralogist. 82 : 1241 - 1254
    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
    		Mineralogical Magazine 1930 22 : 222-224
    • Scotland
      • North West Highlands (Argyllshire)
        • Ardnamurchan
    		Mineralogical Magazine 1965 34 : 1-15.
    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
            • Sky Blue Hill
    		Murdoch, Joseph (1954b), Scawtite and bultfonteinite from Crestmore, California: (abstract): Geological Society of America Bulletin: 65: 1347-1348; Murdoch, Joseph (1955a), Scawtite from Crestmore, California: American Mineralogist: 40: 505-509; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 478.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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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