Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About GrandaiteHide

Cuneo Province Coat of Arms

Cuneo Province, Piedmont, Italy
Bright orange to salmon to brown colour
Vitreous, Waxy
Specific Gravity:
4.378 (Calculated)
Crystal System:
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

Approval Year:

0 :
0 :

Pronounciation of GrandaiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of GrandaiteHide

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

Optical Data of GrandaiteHide

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:

Chemical Properties of GrandaiteHide


Crystallography of GrandaiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:

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.StrontiohurlbutiteSrBe2(PO4)2 Mon. 2/m : P21/b
8.00.CanutiteNaMn3[AsO4][AsO3(OH)]2Mon. 2/m : B2/b

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

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 21, 2019 12:34:34 Page generated: January 18, 2019 21:01:27
Go to top of page