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Grandviewite

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Formula:
Cu3Al9(SO4)2(OH)29
System:
Monoclinic
Colour:
Turquoise-blue
Hardness:
2
Name:
Named after the type locality.
Type material shows greenish blue (rosasite-like) sprays of acicular crystals, grown on a chalcoalumite layer, which covers a mixture of cyanotrichite and visually indistinguishable carbonatecyanotrichite. Also grown directly on cyanotrichite.

Classification of Grandviewite

Approved 2007
7.BB.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
B : With medium-sized cations
30.1.19.

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
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http://www.mindat.org/min-31588.html
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First Recorded Occurrence of Grandviewite

Geological Setting of First Recorded Material:
Secondary mineral in Cu deposit
Associated Minerals at First Recorded Locality:

Physical Properties of Grandviewite

Vitreous
Colour:
Turquoise-blue
Hardness (Mohs):
2
Tenacity:
Sectile
Cleavage:
Perfect
On {100} or {001}
Density:
2.72 g/cm3 (Calculated)

Crystallography of Grandviewite

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Cell Parameters:
a = 10.908Å, b = 6.393Å, c = 10.118Å
β = 107.47°
Ratio:
a:b:c = 1.706 : 1 : 1.583
Unit Cell Volume:
V 673.03 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Flattened, acicular crystals.
Comment:
Space group P2, P21, Pm, P2/m or P21/m.
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.667 (33)
6.208 (100)
5.287 (35)
3.949 (79)
3.625 (10)
2.990 (9)
2.816 (14)
2.721 (8)
2.413 (9)
2.019 (8)

Optical Data of Grandviewite

Type:
Biaxial (-)
RI values:
nα = 1.590(4) nβ = 1.625(4) nγ = 1.645(4)
2V:
Calculated: 72°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
Z = pale blue-green, Y = very pale yellow, X = very pale yellow

Chemical Properties of Grandviewite

Formula:
Cu3Al9(SO4)2(OH)29
Essential elements:
All elements listed in formula:

Relationship of Grandviewite to other Species

7.BB.05CaminiteMg7(SO4)5(OH)4 · H2O
7.BB.10HauckiteFe33+(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81
7.BB.15AntleriteCu3(SO4)(OH)4
7.BB.20DolerophaniteCu2(SO4)O
7.BB.25BrochantiteCu4(SO4)(OH)6
7.BB.30VergasovaiteCu3(SO4)(MoO4,SO4)O
7.BB.35Klebelsbergite(SbO)4(SO4)(OH)2
7.BB.40SchuetteiteHg32+(SO4)O2
7.BB.45ParaotwayiteNi(OH)2-x(SO4,CO3)0.5x
7.BB.50XocomecatliteCu3(TeO4)(OH)4
7.BB.55Pauflerite(V4+O)SO4

Other Names for Grandviewite

Name in Other Languages:

Other Information

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 Grandviewite

Reference List:
Colchester, D. M., Klish, D. R., Leverett, P. & Williams, P. A. (2008): Grandviewite, Cu3Al9(SO4)2(OH)29, a new mineral from the Grandview Mine, Arizona, USA. Australian Journal of Mineralogy, 14 (2), 51-54.

Internet Links for Grandviewite

Localities for Grandviewite

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.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German). [identification announced; no description given yet]
USA
 
  • Arizona
    • Coconino Co.
      • Grandview District
        • Horseshoe Mesa
Australian J. Mineralogy 14(2),51-54(2008)
Mineral and/or Locality  
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