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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.


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Classification of ScottyiteHide

Approved
Approval Year:
2012

Physical Properties of ScottyiteHide

Vitreous
Transparency:
Transparent
Colour:
Dark-blue
Streak:
Pale blue
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {100} and {010}
Parting:
None observed
Density:
4.654 g/cm3 (Calculated)

Optical Data of ScottyiteHide

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.
Surface Relief:
High

Chemical Properties of ScottyiteHide

Formula:
BaCu2Si2O7

Crystallography of ScottyiteHide

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°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 ScottyiteHide

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:
CuO36.98(31) %
BaO35.12(16) %
SiO227.01(61) %
SrO0.28(5) %
Na2O0.06(2) %
Total:99.45 %
Associated Minerals at Type Locality:
Reference:
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 ScottyiteHide

Other Language Names for ScottyiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Lavinskyite10 photos of Scottyite associated with Lavinskyite on mindat.org.
Effenbergerite8 photos of Scottyite associated with Effenbergerite on mindat.org.
Wesselsite5 photos of Scottyite associated with Wesselsite on mindat.org.
Nepheline3 photos of Scottyite associated with Nepheline on mindat.org.
Sugilite3 photos of Scottyite associated with Sugilite on mindat.org.
Perovskite1 photo of Scottyite associated with Perovskite on mindat.org.

Other InformationHide

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 ScottyiteHide

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 ScottyiteHide

Localities for ScottyiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Eifel
      • Daun
        • Oberstadtfeld
Blaß, G. & Schüller, W. (2011): „Unglaubliche“ Kupfermineralien aus der Vulkaneifel: Auf‘m Kopp bei Neroth. Lapis 36 (10), 21-28; 90.
        • Üdersdorf
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)
      • Hillesheim
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)
      • Mayen
        • Ettringen
          • Bellerberg volcano
in the collection of Christof Schäfer
in the collection of Christof Schäfer
South Africa (TL)
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
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.
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