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Grandviewite

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Formula:
Cu
 
3
Al
 
9
(SO
 
4
)
 
2
(OH)
 
29
System:MonoclinicColour: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

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:7.BB.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
B : With medium-sized cations
Dana 8th edition ID:30.1.19.

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
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Type Occurrence of Grandviewite

Type Locality:Grand View Mine (Last Chance Mine; No. 1 Pat claim 3591; No. 5 Pat claim 3592a; No. 4 Pat claim 3592a; Canyon Copper Mine; Grand Canyon Mine), Cape Royal, Horseshoe Mesa, Grand Canyon National Park, Grandview District, Coconino Co., Arizona, USA
Geological Setting of type material:Secondary mineral in Cu deposit
Associated Minerals at type locality:
MalachiteCyanotrichiteChalcoalumiteCarbonatecyanotrichiteBrochantite

Physical Properties of Grandviewite

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

Crystallography of Grandviewite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:P2 {P1 1 2} {P2} {P1 2 1}
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:
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°
Maximum Birefringence:δ = 0.055

Chart 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:
Cu
 
3
Al
 
9
(SO
 
4
)
 
2
(OH)
 
29
Simplified for copy/paste:Cu3Al9(SO4)2(OH)29
Essential elements:Al, Cu, H, O, S
All elements listed in formula:Al, Cu, H, O, S

Relationship of Grandviewite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.BB.05Caminite
Mg
 
7
(SO
 
4
)
 
5
(OH)
 
4
· H
 
2
O
7.BB.10Hauckite
Fe
3+
3
(Mg,Mn
2+
 
)
 
24
Zn
 
18
(SO
 
4
)
 
4
(CO
 
3
)
 
2
(OH)
 
81
7.BB.15Antlerite
Cu
 
3
(SO
 
4
)(OH)
 
4
7.BB.20Dolerophanite
Cu
 
2
(SO
 
4
)O
7.BB.25Brochantite
Cu
 
4
(SO
 
4
)(OH)
 
6
7.BB.30Vergasovaite
Cu
 
3
(SO
 
4
)(MoO
 
4
,SO
 
4
)O
7.BB.35Klebelsbergite
(SbO)
 
4
(SO
 
4
)(OH)
 
2
7.BB.40Schuetteite
Hg
2+
3
(SO
 
4
)O
 
2
7.BB.45Paraotwayite
Ni(OH)
 
2-x
(SO
 
4
,CO
 
3
)
 
0.5x
7.BB.50Xocomecatlite
Cu
 
3
(TeO
 
4
)(OH)
 
4
7.BB.55Pauflerite
(V
4+
 
O)SO
 
4

Other Names for Grandviewite

Synonyms:
IMA2007-004
Other Languages:
German:Grandviewit

Other Information

Health Warning: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

Search Engines:
  • Look for Grandviewite on Google
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  • External Links:
  • Look for Grandviewite on Webmineral
  • Look for Grandviewite on Athena Mineralogy
  • Look for Grandviewite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Find Grandviewite on www.crystalclassics.co.uk
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  • Localities for Grandviewite

    The 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. ? 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
          • Grand Canyon National Park
            • Horseshoe Mesa
              • Cape Royal
    Australian J. Mineralogy 14(2),51-54(2008)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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