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Grandviewite

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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
© Michael Cline

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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.


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
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:

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

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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.
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    (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.
    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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