Scottyite
A valid IMA mineral species
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About Scottyite
Formula:
BaCu2Si2O7
Colour:
Dark-blue
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
4.654 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for Michael Scott (11 February 1945 - ), the first CEO of Apple and a 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.
Unique Identifiers
Mindat ID:
42861
Long-form identifier:
mindat:1:1:42861:9
IMA Classification of Scottyite
Approved
IMA Formula:
BaCu2+2Si2O7
Approval year:
2012
Classification of Scottyite
9.BC.40
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Sty | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Chemistry of Scottyite
Mindat Formula:
BaCu2Si2O7
Element Weights:
Elements listed:
Crystallography of Scottyite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/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
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020060 | Scottyite | Chen Y, Zhang Y, Feng S (2014) Hydrothermal synthesis and properties of pigments Chinese purple BaCuSi2O6 and dark blue BaCu2Si2O7 Dyes and Pigments 105 167-173 | 2014 | synthetic | 0 | 293 | |
| 0019774 | Scottyite | 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 98 478-484 | 2013 | Wessels mine, Kalahari Manganese Fields, South Africa | 0 | 293 | |
| 0018761 | Scottyite | 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 | 2001 | synthetic | 0 | 293 | |
| 0010169 | Scottyite | Janczak J, Kubiak R, Glowiak T (1990) Structure of barium copper pyrosilicate at 300 K Acta Crystallographica C46 1383-1385 |  | 1990 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.586 Å | (52) |
| 3.911 Å | (22) |
| 3.078 Å | (17) |
| 3.053 Å | (64) |
| 3.041 Å | (100) |
| 2.726 Å | (52) |
| 2.430 Å | (37) |
| 1.955 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
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:
Synonyms of Scottyite
Other Language Names for Scottyite
Common Associates
Associations Based on Photo Data:
| 12 photos of Scottyite associated with Lavinskyite | K(LiCu)Cu6(Si4O11)2(OH)4 |
| 11 photos of Scottyite associated with Effenbergerite | BaCuSi4O10 |
| 5 photos of Scottyite associated with Sugilite | KNa2Fe3+2Li3[Si12O30] |
| 5 photos of Scottyite associated with Wesselsite | SrCuSi4O10 |
| 3 photos of Scottyite associated with Nepheline | Na3K(Al4Si4O16) |
| 3 photos of Scottyite associated with Pectolite | NaCa2Si3O8(OH) |
| 2 photos of Scottyite associated with Sodalite | Na4(Si3Al3)O12Cl |
| 1 photo of Scottyite associated with Perovskite | CaTiO3 |
| 1 photo of Scottyite associated with Jennite | Ca9(Si3O9)2(OH)8 · 8H2O |
| 1 photo of Scottyite associated with Colinowensite | BaCuSi2O6 |
Related Minerals - Strunz-mindat Grouping
| 9.BC. | Anorthoyttrialite-(Y) | Y4(SiO4)(Si3O10) |
| 9.BC. | Kozłowskiite | Ca4(Fe2+Sn3)[Si2O7]2[Si2O6OH]2 |
| 9.BC.05 | Yttrialite-(Y) | (Y,Th)2Si2O7 |
| 9.BC.05 | Thortveitite | Sc2Si2O7 |
| 9.BC.05 | Keiviite-(Y) | Y2Si2O7 |
| 9.BC.05 | Keiviite-(Yb) | Yb2Si2O7 |
| 9.BC.05 | Gittinsite | CaZrSi2O7 |
| 9.BC.10 | Parakeldyshite | Na2ZrSi2O7 |
| 9.BC.10 | Keldyshite | (Na,H)2ZrSi2O7 |
| 9.BC.10 | Khibinskite | K2ZrSi2O7 |
| 9.BC.10 | Brunovskyite | NaZrSi2O6(OH) |
| 9.BC.15 | Rankinite | Ca3Si2O7 |
| 9.BC.20 | Barysilite | Pb8Mn2+[Si2O7]3 |
| 9.BC.25 | Edgarbaileyite | [Hg2]2+3[Si2O7] |
| 9.BC.30 | Kristiansenite | Ca4(Sc2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.30 | Nybergite | Ca4Sc3Sn(Si2O7)(Si2O6OH)3 |
| 9.BC.30 | Silesiaite | Ca4(Fe3+2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.35 | Percleveite-(Ce) | Ce2Si2O7 |
| 9.BC.35 | Percleveite-(La) | La2Si2O7 |
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.
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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References for Scottyite
Reference List:
Janczak, J., Kubiak, R., Głowiak, T. (1990) Structure of barium copper pyrosilicate at 300 K. Acta Crystallographica Section C Crystal Structure Communications, 46 (8) 1383-1385 doi:10.1107/s0108270189012618
Hentschel, G (1993) Die Lavaströme der Graulai: eine neue Fundstelle in der Westeifel. [The lava flows of the Graulai: a new site in the West Eifel.]. Lapis, 18 (9) 11-23as 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 doi:10.1006/jssc.2000.8968
Blass, G., Graf, H.-W., Kolitsch, U., Sebold, D. (2009): Die Neufunde aus der Vulkaneifel (II) [The new finds from the volcanic Eifel (II)]. Mineralien-Welt 20 (2), 38-49.[as Unnamed (Ba-Cu Silicate) identical with synthetic BaCu2Si2O7]
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 14. Mineralogical Magazine, 76 (5) 1281-1288 doi:10.1180/minmag.2012.076.5.15
Localities for Scottyite
Showing 6 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany | |
| in the collection of Christof Schäfer |
| in the collection of Christof Schäfer | |
| 90. +1 other reference |
| Blass et al. (2009) |
| Uwe Kolitsch & H. J. Bernhardt (unpublished structure refinement and EPMA data) +2 other references |
South Africa (TL) | |
| Williams et al. (2012) +2 other references |
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Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa