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Scottyite

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Formula:
BaCu2Si2O7
System:
Orthorhombic
Colour:
Dark-blue
Hardness:
4 - 5
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 2012
mindat.org URL:
http://www.mindat.org/min-42861.html
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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
Associated Minerals at Type Locality:

Physical Properties of Scottyite

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

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°
Ratio:
a:b:c = 0.52 : 1 : 0.523
Unit Cell Volume:
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 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)

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.
Surface Relief:
High

Chemical Properties of Scottyite

Formula:
BaCu2Si2O7
Essential elements:
All elements listed in formula:
Analytical Data:
Electron microprobe analysis, average of 8 points. Emp
CuO (36.98)(31)
BaO (35.12)(16)
SiO2 (27.01)(61)
SrO (0.28) (5)
Na2O (0.06)(2)
total = 99.45(65)
Empirical Formula:
Ba1.00Sr0.01Na0.01Cu2.04Si1.97O7

Other Names for Scottyite

Name in Other Languages:

Other Information

Other Information:
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:
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

Localities for Scottyite

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.
(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
 
  • 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)
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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