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Grandaite

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About GrandaiteHide

Cuneo Province Coat of Arms

Cuneo Province, Piedmont, Italy
Formula:
Sr2Al(AsO4)2(OH)
Colour:
Bright orange to salmon to brown colour
Lustre:
Vitreous, Waxy
Specific Gravity:
4.378 (Calculated)
Crystal System:
Monoclinic
Name:
Due to its size, Cuneo Province is known in Piedmont by the nickname "Provincia Granda" or, more simply, "la Granda" (i.e., The Large One). The mineral is named after this informal appellation of the province that includes the type locality.
This page provides mineralogical data about Grandaite.


Classification of GrandaiteHide

Approved
Approval Year:
2013
8.00.

8 : PHOSPHATES, ARSENATES, VANADATES
0 :
0 :

Pronounciation of GrandaiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of GrandaiteHide

Vitreous, Waxy
Colour:
Bright orange to salmon to brown colour
Streak:
Reddish brown
Density:
4.378 g/cm3 (Calculated)

Optical Data of GrandaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.726(1) nβ = 1.731(1) nγ = 1.752(1)
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of GrandaiteHide

Formula:
Sr2Al(AsO4)2(OH)

Crystallography of GrandaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 7.5764(5) Å, b = 5.9507(4) Å, c = 8.8050(6) Å
β = 112.551(2)°
Ratio:
a:b:c = 1.273 : 1 : 1.48
Unit Cell V:
366.62 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.194(100)
2.981(51)
2.922(40)
2.743(31)
2.705(65)
2.087(52)
1.685(25)
1.663(13)

Type Occurrence of GrandaiteHide

General Appearance of Type Material:
Thin masses or as fan-like aggregates of small (< 1 mm) crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo Regionale di Scienze Naturali di Torino, Sezione di Mineralogia, Petrografia e Geologia, Torino, Italy, catalogue number M/ 15999, and Museo Civico Archeologico e di Scienze Naturali ‘‘Federico E
Geological Setting of Type Material:
Reaction between the ore minerals and hydrothermal solutions, found on the dumps of Valetta Mine.
Associated Minerals at Type Locality:

Synonyms of GrandaiteHide

Relationship of Grandaite to other SpeciesHide

Other Members of this group:
ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)Mon. 2/m : P21/m
GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
LombardoiteBa2Mn3+(AsO4)2(OH)Mon. 2/m : P21/m
TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
Unnamed (possible ordered As-analogue of Tokyoite)Ba2Mn[(As,V)O4]2(OH)Mon. 2/m : P21/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz1 photo of Grandaite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.00.UM1997-10-AsO:CaV(Ca, V, AsO4) ?
8.00.Mg-FillowiteNa2Ca(Mn2+4Mg2Fe2+)7(PO4)6
8.00.StrontiohurlbutiteSrBe2(PO4)2 Mon. 2/m : P21/b
8.00.CanutiteNaMn3[AsO4][AsO3(OH)]2Mon. 2/m : B2/b
8.00.Metauramphite(NH4)2(UO2)2(PO4)2·6H2O

Other InformationHide

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 GrandaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cámara, F., Ciriotti, M.E., Bittarello, E., Nestola, F., Bellatreccia, F., Massimi, F., Radica, F., Costa, E., Benna, P. and Piccoli, G.C. (2013) Grandaite, IMA 2013- 059. CNMNC Newsletter No. 18, December 2013, page 3250; Mineralogical Magazine: 77: 3249-3258.
Cámara, F., Ciriotti, M.E., Bittarello, E., Nestola, F., Massimi, F., Radica, F., Costa, E., Benna, P., Piccoli, G.C. (2014): As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: I. Grandaite, Sr2Al(AsO4)2(OH), description and crystal structure. Mineralogical Magazine: 78: 757-774.

Internet Links for GrandaiteHide

Localities for GrandaiteHide

ⓘ - 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.
Italy (TL)
 
  • Piedmont
    • Cuneo Province
      • Maira Valley
        • Canosio
          • Vallone della Valletta
Cámara, F., Ciriotti, M.E., Bittarello, E., Nestola, F., Massimi, F., Radica, F., Costa, E., Benna, P., Piccoli, G.C. (2014) As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: I. Grandaite, Sr2Al(AsO4)2(OH), description and crystal structure. Mineralogical Magazine, 78, 757-774; Cámara, F., Ciriotti, M. (2016) Polytypism, topological and crystalchemical relations among natrochalcite group and brackebuschite group minerals. EMC2016 - 2nd European Mineralogical Conference, 11-15 September 2016, Rimini, Italy, Abstracts Volume, S16-8; Cámara, F., Bittarello, E., Ciriotti, M.E., Nestola, F., Radica, F., Massimi, F., Balestra, C., Bracco, R. (2017a) As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: III. Canosioite, Ba2Fe3+(AsO4)2(OH), description and crystal structure. Mineralogical Magazine, 81, 305–317; Cámara, F., Biagioni, C., Ciriotti, M.E., Bosi, F., Kolitsch, U., Paar, W.H., Blass, G., Bittarello, E. (2017c) Piccoliite, a new mineral of the pilawite group. Congresso SIMP-SGI-SOGEI-AIV 2017, Pisa, 3-6 settembre 2017, Abstract book, page 120; http://www.socgeol.it/files/download/abstract%20book/abstract_book_pisa_2017_doi.pdf
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