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Piemontite-(Sr)

Formula:
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
System:MonoclinicColour:Dark red
Hardness:6
Name:Named as the strontium-dominant analogue of piemontite.


Epidote Group.

Classification of Piemontite-(Sr)

IMA status:Approved 1989
Strunz 8th edition ID:8/C.23-40
Nickel-Strunz 10th (pending) edition ID:9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Dana 8th edition ID: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)
Hey's CIM Ref.:16.16.25

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Piemontite-(Sr)

Co-type Localities:Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
Year of Discovery:1990

Physical Properties of Piemontite-(Sr)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Dark red
Streak:Purplish brown
Hardness (Mohs):6

Crystallography of Piemontite-(Sr)

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

Optical Data of Piemontite-(Sr)

Type:Biaxial (+)
Dispersion:very strong

Chemical Properties of Piemontite-(Sr)

Formula:
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Essential elements:Al, Ca, H, O, Si, Sr
All elements listed in formula:Al, Ca, H, Mn, O, Si, Sr
Common Impurities:Fe,Ti,Mg,H2O

Relationship of Piemontite-(Sr) to other Species

Related to:
  • Epidote Group
  • Related Minerals - Nickel-Strunz Grouping):
    9.BG.05Allanite-(Ce)
    {CaCe}{Al
     
    2
    Fe
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Allanite-(La)
    {CaLa}{Al
     
    2
    Fe
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Allanite-(Y)
    {CaY}{Al
     
    2
    Fe
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Clinozoisite
    {Ca
     
    2
    }{Al
     
    3
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Dissakisite-(Ce)
    {CaCe}{Al
     
    2
    Mg}[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Dollaseite-(Ce)
    {CaCe}{MgAlMg}[F|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Epidote
    {Ca
     
    2
    }{Al
     
    2
    Fe
    3+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Epidote-(Pb)
    {CaPb}{Al
     
    3
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Khristovite-(Ce)
    {CaCe}{MgAlMn
    2+
     
    }[F|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Mukhinite
    {Ca
     
    2
    }{Al
     
    2
    V
    3+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Piemontite
    {Ca
     
    2
    }{Al
     
    2
    Mn
    3+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Manganiandrosite-(La)
    {LaMn
    2+
     
    }{Mn
    3+
     
    AlMn
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Tawmawite
    Ca
     
    2
    (Al,Fe
    3+
     
    ,Cr)
     
    3
    [O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Manganipiemontite-(Sr)
    {CaSr}{Mn
    3+
     
    AlMn
    3+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Ferriallanite-(Ce)
    {CaCe}{Fe
    3+
     
    AlFe
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Clinozoisite-(Sr)
    CaSrAl
     
    3
    (Si
     
    2
    O
     
    7
    )(SiO
     
    4
    )O(OH)
    9.BG.05Ferriepidote
    9.BG.05Manganiandrosite-(Ce)
    (Mn
    2+
     
    ,Ca)(Ce,REE)AlMn
    3+
     
    Mn
    2+
     
    (Si
     
    2
    O
     
    7
    )(SiO
     
    4
    )O(OH)
    9.BG.05Dissakisite-(La)
    {CaLa}{Al
     
    2
    Mg}[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Vanadoandrosite-(Ce)
    {Mn
    2+
     
    Ce}{V
    3+
     
    AlMn
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05Androsite-(La)
    9.BG.05Uedaite-(Ce)
    {Mn
    2+
     
    Ce}{Al
     
    2
    Fe
    2+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.05IMA2006-055
    CaSrAl
     
    2
    Fe
    3+
     
    (Si
     
    2
    O
     
    7
    )(SiO
     
    4
    )O(OH)
    9.BG.10Zoisite
    {Ca
     
    2
    }{Al
     
    3
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.15Macfallite
    Ca
     
    2
    (Mn
    3+
     
    ,Al)
     
    3
    [(OH)
     
    3
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.15Sursassite
    Mn
     
    2
    Al
     
    3
    [(OH)
     
    3
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    9.BG.20Julgoldite-(Fe2+)
    Ca
     
    2
    (Fe
    2+
     
    ,Mg)(Fe
    3+
     
    ,Al)
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Okhotskite
    Ca
     
    8
    (Mn,Mg)
     
    4
    (Mn,Al,Fe)
     
    8
    Si
     
    12
    O
     
    56-n
    (OH)
     
    n
    9.BG.20Pumpellyite-(Fe2+)
    Ca
     
    2
    Fe
    2+
     
    Al
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Pumpellyite-(Fe3+)
    Ca
     
    2
    (Fe
    3+
     
    ,Mg,Fe
    2+
     
    )(Al,Fe
    3+
     
    )
     
    2
    [(OH,O)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Pumpellyite-(Mg)
    Ca
     
    2
    MgAl
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Pumpellyite-(Mn2+)
    Ca
     
    2
    (Mn
    2+
     
    ,Mg)(Al,Mn
    3+
     
    ,Fe
    3+
     
    )
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Shuiskite
    Ca
     
    2
    (Mg,Al)(Cr,Al)
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · 2H
     
    2
    O
    9.BG.20Julgoldite-(Fe3+)
    Ca
     
    2
    (Fe
    3+
     
    ,Mg)(Fe
    3+
     
    ,Al)
     
    2
    [(OH,O)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Pumpellyite-(Al)
    Ca
     
    2
    (Al,Fe
    2+
     
    ,Mg)Al
     
    2
    [(OH,O)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Poppiite
    Ca
     
    2
    (V
    3+
     
    ,Fe
    3+
     
    ,Mg)(V
    3+
     
    ,Al)
     
    2
    [(OH,O)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.20Julgoldite-(Mg)
    Ca
     
    2
    (Mg,Fe
    2+
     
    )(Fe
    3+
     
    ,Al)
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O
    9.BG.25Ganomalite
    Pb
     
    9
    Ca
     
    5
    Mn[O|SiO
     
    4
    |(Si
     
    2
    O
     
    7
    )
     
    4
    ]
    9.BG.30Rustumite
    Ca
     
    10
    (Si
     
    2
    O
     
    7
    )
     
    2
    (SiO
     
    4
    )Cl
     
    2
    (OH)
     
    2
    9.BG.35Vesuvianite
    Ca
     
    10
    (Mg,Fe)
     
    2
    Al
     
    4
    Si
     
    9
    O
     
    34
    (OH)
     
    4
    9.BG.35Wiluite
    Ca
     
    19
    (Al,Mg,Fe,Ti)
     
    13
    (B,Al,[ ])
     
    5
    Si
     
    18
    O
     
    68
    (O,OH)
     
    10
    9.BG.35Manganvesuvianite
    Ca
     
    19
    Mn(Al,Mn,Fe)
     
    19
    (Mg,Mn)
     
    2
    Si
     
    18
    O
     
    69
    (OH)
     
    9
    9.BG.35Fluorvesuvianite
    Ca
     
    19
    (Al,Mg,Fe
    2+
     
    )
     
    13
    [(F,OH,O)
     
    10
    |(SiO
     
    4
    )
     
    10
    |(Si
     
    2
    O
     
    7
    )
     
    4
    ]
    9.BG.40Vyuntspakhkite-(Y)
    Y
     
    4
    Al
     
    3
    Si
     
    5
    O
     
    18
    (OH)
     
    5
    9.BG.45Dellaite
    Ca
     
    6
    Si
     
    3
    O
     
    11
    (OH)
     
    2
    9.BG.50Gatelite-(Ce)
    CaCe
     
    3
    Al
     
    2
    (Al,Mg)(Mg,Fe
    2+
     
    ,Al)[(O,F)|(OH,O)
     
    2
    |(SiO
     
    4
    )
     
    3
    |Si
     
    2
    O
     
    7
    ]
    9.BG.55Västmanlandite-(Ce)
    Ca(Ce,La)
     
    3
    Al
     
    2
    Mg
     
    2
    [F|(OH)
     
    2
    |(SiO
     
    4
    )
     
    3
    |Si
     
    2
    O
     
    7
    ]
    Related Minerals - Hey's Index Grouping:
    16.16.1Kanonaite
    Mn
    3+
     
    Al[O|SiO
     
    4
    ]
    16.16.2Spessartine
    Mn
    2+
    3
    Al
     
    2
    [SiO
     
    4
    ]
     
    3
    16.16.3Davreuxite
    MnAl
     
    6
    Si
     
    4
    O
     
    17
    (OH)
     
    2
    16.16.4Sursassite
    Mn
     
    2
    Al
     
    3
    [(OH)
     
    3
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    16.16.5Carpholite
    Mn
    2+
     
    Al
     
    2
    [(OH)
     
    4
    |Si
     
    2
    O
     
    6
    ]
    16.16.6Kellyite
    Mn
    2+
    2
    Al[(OH)
     
    4
    |AlSiO
     
    5
    ]
    16.16.7Pennantite
    (Mn
     
    5
    Al)(Si
     
    3
    Al)O
     
    10
    (OH)
     
    8
    16.16.8Akatoreite
    (Mn
    2+
     
    ,Fe
    2+
     
    )
     
    9
    Al
     
    2
    [(OH)
     
    3
    |HSi
     
    4
    O
     
    13
    ]
    16.16.9Ganophyllite
    (K,Na,Ca)
     
    2
    Mn
     
    8
    (Si,Al)
     
    12
    (O,OH)
     
    32
    ·8H
     
    2
    O
    16.16.10Kôzulite
    [Na][Na
     
    2
    ][Mn
    2+
    4
    (Fe
    3+
     
    ,Al)][(OH)
     
    2
    |Si
     
    8
    O
     
    22
    ]
    16.16.11Masutomilite
    (K,Rb)(Li,Mn
    3+
     
    ,Al)
     
    3
    [(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    16.16.13Howieite
    Na(Fe,Mn)
     
    10
    (Fe,Al)
     
    2
    Si
     
    12
    O
     
    31
    (OH)
     
    13
    16.16.14Eggletonite
    (Na,K,Ca)
     
    2
    (Mn,Fe)
     
    8
    (Si,Al)
     
    12
    O
     
    29
    (OH)
     
    7
    ·11H
     
    2
    O
    16.16.15Bannisterite
    Ca
     
    0.5
    (K,Na)
     
    0.5
    (Mn,Fe,Zn)
     
    10
    (Si,Al)
     
    16
    O
     
    38
    (OH)
     
    8
    ·5.5H
     
    2
    O
    16.16.16Taneyamalite
    (Na,Ca)(Mn,Mg,Fe)
     
    12
    Si
     
    12
    (O,OH)
     
    44
    16.16.17Zussmanite
    K(Fe,Mg,Mn)
     
    13
    (Si,Al)
     
    18
    O
     
    42
    (OH)
     
    14
    16.16.18Coombsite
    K(Mn,Fe,Mg)
     
    13
    (Si,Al)
     
    18
    O
     
    42
    (OH)
     
    14
    16.16.19Henritermierite
    Ca
     
    3
    (Mn
    3+
     
    ,Al)
     
    2
    [(OH)
     
    4
    |(SiO
     
    4
    )
     
    2
    ]
    16.16.20Macfallite
    Ca
     
    2
    (Mn
    3+
     
    ,Al)
     
    3
    [(OH)
     
    3
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    16.16.21Ottrélite
    (Mn
    2+
     
    ,Fe
    2+
     
    ,Mg)Al
     
    2
    [O|(OH)
     
    2
    |SiO
     
    4
    ]
    16.16.22Piemontite
    {Ca
     
    2
    }{Al
     
    2
    Mn
    3+
     
    }[O|OH|SiO
     
    4
    |Si
     
    2
    O
     
    7
    ]
    16.16.23Okhotskite
    Ca
     
    8
    (Mn,Mg)
     
    4
    (Mn,Al,Fe)
     
    8
    Si
     
    12
    O
     
    56-n
    (OH)
     
    n
    16.16.24Pumpellyite-(Mn2+)
    Ca
     
    2
    (Mn
    2+
     
    ,Mg)(Al,Mn
    3+
     
    ,Fe
    3+
     
    )
     
    2
    [(OH)
     
    2
    |SiO
     
    4
    |Si
     
    2
    O
     
    7
    ] · H
     
    2
    O

    Other Names for Piemontite-(Sr)

    Synonyms:
    IMA1989-031Strontiopiemontite
    German names:
    Strontiopiemontit
    Russian names:
    Пьемонтит-(Sr)
    Spanish names:
    Strontiopiemontita

    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 Piemontite-(Sr)

    Reference List: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.

    Internet Links for Piemontite-(Sr)

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  • Raman and XRD data at RRUFF project
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  • Strontiopiemontite details from Handbook of Mineralogy (PDF)
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    Localities for Piemontite-(Sr)

    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.
    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
    Redazione (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia Ferrania Club, 19, 3-5.
    Japan
     
    • Hokkaido Island
      • Tokoro District
    Akasaka et al (1988) Mineralogy and Petrology, 38, 105-116.
    • 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 Prefecture
          • Nishi-Tama-gun
            • Okutama
    [MinRec 32:419]; Kato & Matsubara (1986) Sanko-Gakkai Kou'en-Youshi, 69.
    • Shikoku Island
    mylonite.eps.nagoya-u.ac.jp/~enami/abstract/ganko0001.html
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Hotazel
    Minerals of South Africa
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon & Ida Ralph 1993-2008. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register.