Scottyite
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Formula:
BaCu2Si2O7
Colour:
Dark-blue
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
4.654 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for Michael Scott (1945 - ), first CEO of Apple and significant sponsor of the Rruff project.
Also known as a synthetic phase. Topologically related to a group of compounds with the general formula BaM2+2Si2O7, where M = Be (barylite and clinobarylite), Fe (andrémeyerite), Mg, Mn, Co, and Zn.
Classification of Scottyite
Approved
Approval Year:
2012
Physical Properties of Scottyite
Vitreous
Transparency:
Transparent
Colour:
Dark-blue
Streak:
Pale blue
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {100} and {010}
on {100} and {010}
Parting:
None observed
Density:
4.654 g/cm3 (Calculated)
Optical Data of Scottyite
Type:
Biaxial (-)
RI values:
nα = 1.750(1) nβ = 1.761(1) nγ = 1.765(1)
2V:
Measured: 66° (2)
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Chemical Properties of Scottyite
Formula:
BaCu2Si2O7
Elements listed:
Crystallography of Scottyite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Cell Parameters:
a = 6.8556(2) Å, b = 13.1725(4) Å, c = 6.8901(2) Å
α = 90°, β = 90°, γ = 90°
α = 90°, β = 90°, γ = 90°
Ratio:
a:b:c = 0.52 : 1 : 0.523
Unit Cell V:
622.21 ų
Morphology:
Blocky grains with striations parallel to the c axis. Crystals are found up to 0.4 × 0.3 × 0.3 mm.
Twinning:
None observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.586 | (52) |
| 3.911 | (22) |
| 3.078 | (17) |
| 3.053 | (64) |
| 3.041 | (100) |
| 2.726 | (52) |
| 2.430 | (37) |
| 1.955 | (20) |
Type Occurrence of Scottyite
General Appearance of Type Material:
Blue massive; Blocky grains
Place of Conservation of Type Material:
Mineral Museum of the University of Arizona, Tucson, Arizona, USA, catalogue number 19334
Empirical Formula of Type Material:
Ba1.00Sr0.01Na0.01Cu2.04Si1.97O7
Chemical Analysis of Type Material:
| CuO | 36.98(31) % |
|---|---|
| BaO | 35.12(16) % |
| SiO2 | 27.01(61) % |
| SrO | 0.28(5) % |
| Na2O | 0.06(2) % |
| Total: | 99.45 % |
Associated Minerals at Type Locality:
Type Description:
Yang, H., Downs, R. T., Evans, S. H., & Pinch, W. W. (2013). Scottyite, the natural analog of synthetic BaCu2Si2O7, a new mineral from the Wessels mine, Kalahari Manganese Fields, South Africa. American Mineralogist, 98(2-3), 478-484.
Synonyms of Scottyite
Other Language Names for Scottyite
Common Associates
Associated Minerals Based on Photo Data:
| Lavinskyite | 10 photos of Scottyite associated with Lavinskyite on mindat.org. |
| Effenbergerite | 8 photos of Scottyite associated with Effenbergerite on mindat.org. |
| Wesselsite | 5 photos of Scottyite associated with Wesselsite on mindat.org. |
| Nepheline | 3 photos of Scottyite associated with Nepheline on mindat.org. |
| Sugilite | 3 photos of Scottyite associated with Sugilite on mindat.org. |
| Perovskite | 1 photo of Scottyite associated with Perovskite on mindat.org. |
Other Information
Notes:
Insoluble in water, acetone, or hydrochloric acid
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 Scottyite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Janczak, J., Kubiak, R. & Glowiak, T. (1990): Structure of barium copper pyrosilicate at 300 K. Acta Crystallographica, C46, 1383-1385.
Hentschel, G. (1993): Die Lavaströme der Graulai: eine neue Fundstelle in der Westeifel. Lapis 12 (9), 11-23. (in German) [as Unnamed (Ba-Cu Silicate) identical with synthetic BaCu2Si2O7]
Yamada, T., Hiroi, Z. & Takano, M. (2001): Spin-1/2 quantum antiferromagnetic chains with tunable superexchange interactions found in BaCu2(Si1-xGex)2O7. Journal of Solid State Chemistry 156, 101-109.
G. Blass, H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German) [as Unnamed (Ba-Cu Silicate) identical with synthetic BaCu2Si2O7]
Yang, H., Downs, R.T., Evans, S.H., Pinch, W.W. and Origlieri, M.J. (2012): Scottyite, IMA 2012-027. CNMNC Newsletter No. 14, October 2012, page 1284; Mineralogical Magazine, 76, 1281-1288.
Yang, H., Downs, R.T., Evans, S., Pinch, W. (2013): Scottyite, the natural analogue of synthetic BaCu2Si2O7, a new mineral from the Wessels mine, Kalahari Manganese Fields, South Africa. American Mineralogist, 98, 478–484.
Internet Links for Scottyite
mindat.org URL:
https://www.mindat.org/min-42861.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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Localities for Scottyite
This 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.
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.
Germany | |
| Blaß, G. & Schüller, W. (2011): „Unglaubliche“ Kupfermineralien aus der Vulkaneifel: Auf‘m Kopp bei Neroth. Lapis 36 (10), 21-28; 90. |
| G. Blass, H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German) |
| Hentschel, G. (1993): Die Lavaströme der Graulai: eine neue Fundstelle in der Westeifel. Lapis 12 (9), 11-23. (in German); G. Blass, H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German); Uwe Kolitsch & H. J. Bernhardt (unpublished structure refinement and EPMA data) |
| in the collection of Christof Schäfer |
| in the collection of Christof Schäfer | |
South Africa (TL) | |
| http://rruff.info/scottyite; Yang, H., Downs, R.T., Evans, S.H., Pinch, W.W. and Origlieri, M.J. (2012): Scottyite, IMA 2012-027. CNMNC Newsletter No. 14, October 2012, page 1284; Mineralogical Magazine, 76, 1281-1288; Yang, H., Downs, R.T., Evans, S., Pinch, W. (2013): Scottyite, the natural analogue of synthetic BaCu2Si2O7, a new mineral from the Wessels mine, Kalahari Manganese Fields, South Africa. American Mineralogist, 98, 478–484. |
Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa