Scawtite Mineral Data + 
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- 64.2.1.1 Scawtite Ca7Si6(CO3)O18·2(H2O) C 2/m 2/m
- VIII/F.21-10 Nekoite Ca3Si6O15·7(H2O) P1 1
- VIII/F.21-20 Scawtite Ca7Si6(CO3)O18·2(H2O) C 2/m 2/m
- VIII/F.21-30 Xonotlite Ca6Si6O17(OH)2 P 2/a 2/m
- VIII/F.21-40 Tacharanite Ca12Al2Si18O33(OH)36 A centered Mono
General Scawtite Information |
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 Chemical Formula: |
Ca7Si6(CO3)O18·2(H2O) | ||
| Composition: |
Molecular Weight = 833.09 gm | ||
| Calcium 33.68 % Ca 47.12 % CaO | |||
| Silicon 20.23 % Si 43.27 % SiO2 | |||
| Hydrogen 0.48 % H 4.32 % H2O | |||
| Carbon 1.44 % C 5.28 % CO2 | |||
| Oxygen 44.17 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca7Si6(CO3)O18·2(H2O) | ||
| Environment: |
Rare constituent of hybrid rocks formed by the assimilation of limestone by dolerite. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1929 | ||
| Locality: |
Scawt Hill, Antrim, Ireland. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after its locality. | ||
| Synonym: |
ICSD 73333 | ||
| PDF 31-361 | |||
Scawtite Image | |||
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Images:
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Scawtite Crystallography |
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| Axial Ratios: |
a:b:c =0.6667:1:0.4362 | ||
| Cell Dimensions: |
a = 10.121, b = 15.18, c = 6.623, Z = 2; beta = 100.55° V = 1,000.34 Den(Calc)= 2.77 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.02(1), 2.991(0.8), 3.204(0.55), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Scawtite |
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| Cleavage: |
[001] Perfect, [010] Poor | ||
| Color: |
Colorless. | ||
| Density: |
2.77 | ||
| Diaphaniety: |
Transparent | ||
| Habit: |
Platy - Sheet forms (e.g. micas). | ||
| Hardness: |
4-5 - Fluorite-Apatite | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Scawtite |
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| Gladstone-Dale: |
CI meas= -0.023 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2199,KPDmeas= 0.2199,KC= 0.2148 |
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| Optical Data: |
Biaxial (+), a=1.597-1.603, b=1.606-1.609, g=1.618-1.621, bire=0.0180-0.0210, 2V(Calc)=72-84, 2V(Meas)=74-78. | ||
Calculated Properties of Scawtite |
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| Electron Density: |
relectron=2.78 gm/cc |
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| Fermion Index |
Fermion Index = 0.01027 Boson Index = 0.98973 |
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| Photoelectric: |
PEScawtite = 4.91 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Scawtite is Not Radioactive |
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Scawtite Classification |
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| Dana Class: |
64.2.1.1 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups | ||
| (64.2)3-membered rings with other anion groups | |||
| (64.2.1)Dana Group | |||
| Strunz Class: |
VIII/F.21-20 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) Triplet chains [Si6O15/17]6-/10- and modified triplet bands | |||
| VIII/F.21 - Nekoite - Tacharanite series | |||
Other Scawtite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Scawtite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris Search for Scawtite using: Visit our Advertisers for Scawtite : Translate Scawtite Mineral Data : Ask about Scawtite here : Print or Cut-and-Paste your Scawtite Specimen Label here :
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