IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
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 Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Piemontite-(Sr)

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

About Piemontite-(Sr)Hide

Flag of Piedmont, Italy
Formula:
{CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Colour:
Dark red
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.65 - 3.71
Crystal System:
Monoclinic
Name:
Named strontiopiemontite by Bonazzi et al. (1990), as the strontium-dominant analogue of piemontite. It was renamed renamed by the Epidote Subcommittee of the CNMMN in 2006 to piemontite-(Sr). The root name is for the Piedmont region in Italy; Piemont in Italian.

Classification of Piemontite-(Sr)Hide

Approved
Approval Year:
1989
First Published:
1990
9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.1a.12

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.16.25

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn

Physical Properties of Piemontite-(Sr)Hide

Vitreous
Transparency:
Transparent
Colour:
Dark red
Streak:
Purplish brown
Hardness:
Cleavage:
Perfect
{001}
Density:
3.65 - 3.71 g/cm3 (Measured)    3.73 g/cm3 (Calculated)

Optical Data of Piemontite-(Sr)Hide

Type:
Biaxial (+)
Dispersion:
very strong

Chemical Properties of Piemontite-(Sr)Hide

Formula:
{CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaSr(Al2Mn3+)[Si2O7][SiO4]O(OH)
Common Impurities:
Fe,Ti,Mg,H2O

Crystallography of Piemontite-(Sr)Hide

Crystal System:
Monoclinic
Cell Parameters:
a = 8.86 Å, b = 5.68 Å, c = 10.19 Å
β = 114.7°
Ratio:
a:b:c = 1.56 : 1 : 1.794
Unit Cell V:
465.89 ų (Calculated from Unit Cell)

Type Occurrence of Piemontite-(Sr)Hide

Place of Conservation of Type Material:
Museo di Mineralogia dell'Università di Firenze.
Reference:
Bonazzi, P., Menchetti, S. Palenzona, A. (1990) Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy: 2: 519-523.

Synonyms of Piemontite-(Sr)Hide

Other Language Names for Piemontite-(Sr)Hide

Relationship of Piemontite-(Sr) to other SpeciesHide

Other Members of this group:
Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Piemontite-(Pb){CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH) Mon. 2/m : P21/m
Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Unnamed (Ga-dominant member of the epidote group){Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH)

Related Minerals - Nickel-Strunz GroupingHide

9.BG.XCyprineCa19Cu2+(Al10Mg2)Si18O68(OH)10Tet. 4/m : P4/n
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2Mon. 2/m : P21/m
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2OMon.
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20ShuiskiteCa2MgCr2(Si2O7)(SiO4)(OH)2 · 2H2OMon.
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH) · H2OMon.
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2OMon.
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m)
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2Mon. 2/m : P21/b
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si2O15(OH)2FMon. 2/m : P21/m

Related Minerals - Dana Grouping (8th Ed.)Hide

58.2.1a.1Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.2Allanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.3Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.4Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.5Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.6Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
58.2.1a.7Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.8Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.9Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
58.2.1a.10Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.11Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.16.1KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
16.16.2SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
16.16.3DavreuxiteMnAl6Si4O17(OH)2Mon.
16.16.4SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4Orth.
16.16.6KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
16.16.7PennantiteMn2+5Al(AlSi3O10)(OH)8Tric.
16.16.8AkatoreiteMn2+9Al2Si8O24(OH)8Tric.
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon.
16.16.10Mangano-ferri-eckermannite{Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2Mon.
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon.
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
16.16.15Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14Trig.
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
16.16.20MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
16.16.21Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
16.16.23OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2OMon.
16.16.24Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.

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 Piemontite-(Sr)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bonazzi, P., Menchetti, S. Palenzona, A. (1990) Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy: 2: 519-523.
Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Giere, R., Huess-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y., Pasero, M. (2006) Recommended nomeclature of epidote-group minerals. European Journal of Mineralogy: 18: 551-567.
Nagashima, M., Armbruster, T., Akasaka, M., Minakawa, T. (2010) Crystal chemistry of Mn2+-, Sr-rich and REE-bearing piemontite from the Kamisugai mine in the Sambagawa metamorphic belt, Shikoku, Japan. Journal of Mineralogical and Petrological Sciences: 105: 142-150.

Internet Links for Piemontite-(Sr)Hide

Localities for Piemontite-(Sr)Hide

ⓘ - 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
 
  • Aosta Valley
    • Saint-Marcel
  • Liguria
    • Genova Province
      • Ne
        • Graveglia Valley
Redazionale (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia del Ferrania Club, 19 , 3-5.
Bonazzi, P., Menchetti, S. & Palenzona, A. (1990): Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy, 2, 519-523.
          • Reppia
            • Monte Copello
Redazione (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia Ferrania Club, 19, 3-5.
Japan
 
  • Hokkaido
    • Okhotsk Subprefecture (Abashiri Province)
      • Kitami City
Akasaka et al (1988) Mineralogy and Petrology, 38, 105-116.; Kenji Togari, Masahide Akasaka and Yoshiyuki Kawaguchi (1986) INESITE FROM THE KOKURIKI MINE, HOKKAIDO, JAPAN. Jour. Fac. Sci., Hokkaido Univ., Ser. IV, vol. 21, no. 4, Feb., 1986, pp. 669-677.
  • Honshu Island
    • Chubu Region
      • Niigata Prefecture
www-jm.eps.s.u-tokyo.ac.jp/2002cd-rom/pdf/j038/j038-003_e.pdf.
    • Kanto Region
      • Tokyo Metropolis
        • Nishi-Tama-gun
          • Okutama-cho
[MinRec 32:419]; Kato & Matsubara (1986) Sanko-Gakkai Kou'en-Youshi, 69.; Matsubara S, Miyawaki R, Yokoyama K, Shimizu M, Imai H (2004) Tokyoite, Ba2Mn3+(VO4)2(OH), a new mineral from the Shiromaru mine, Okutama, Tokyo, Japan. Journal of Mineralogical and Petrological Sciences 99, 363-367; photo in: Koubutsu Doshikai (2017) Kanto-to Shuhen-no Koubutsu (279pp).
  • Shikoku Island
    • Kochi Prefecture
      • Nankoku city
Journal of Mineralogical and Petrological Sciences 103,400-406(2008)
Ohe Rikosha specimens, Kyoto; Alfredo Petrov collection.
mylonite.eps.nagoya-u.ac.jp/~enami/abstract/ganko0001.html; Enami, M., & Banno, Y. (2001). Partitioning of Sr between coexisting minerals of the hollandite-and piemontite-groups in a quartz-rich schist from the Sanbagawa metamorphic belt, Japan. American Mineralogist, 86(3), 205-214.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Minerals of South Africa
UK
 
  • Wales
    • Gwynedd
      • Lleyn Peninsula
        • Llanfaelrhys
          • Rhiw
UKJMM Vol.29 p.14; Cotterell, T., Tayler, R.(2012): Epidote-(Sr) and piemontite-(Sr): two minerals new to Britain from Benallt mine, Pen Llŷn, Gwynedd, Wales. UK Journal of Mines and Minerals 33:39-42.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, 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: October 19, 2018 21:55:39 Page generated: October 16, 2018 10:01:20
Go to top of page