Piemontite-(Sr) (original) (raw)
A valid IMA mineral species
About Piemontite-(Sr)Hide
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Formula:
(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)
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.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3773:6
5e3cdcc3-3bdd-40a6-8af1-96e413724536
IMA Classification of Piemontite-(Sr)Hide
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IMA Formula:
CaSr(Al2Mn3+)[Si2O7][SiO4]O(OH)
Type description reference:
Bonazzi, Paola, Menchetti, Silvio, Palenzona, Andrea (1990) Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy, 2 (4) 519-523 doi:10.1127/ejm/2/4/0519
Classification of Piemontite-(Sr)Hide
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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
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Pmt-Sr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Pmt | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Pie | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Piemontite-(Sr)Hide
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Density:
3.65 - 3.71 g/cm3 (Measured) 3.73 g/cm3 (Calculated)
Optical Data of Piemontite-(Sr)Hide
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Optical Extinction:
Y = b.
Chemistry of Piemontite-(Sr)Hide
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Mindat Formula:
(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)
Common Impurities:
Fe,Ti,Mg,H2O
Crystallography of Piemontite-(Sr)Hide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.8942(1) Å, b = 5.6540(1) Å, c = 10.1928(2) Å
β = 115.100(1)°
Ratio:
a:b:c = 1.573 : 1 : 1.803
Unit Cell V:
464.17 ų (Calculated from Unit Cell)
Morphology:
Prismatic crystals, elongated parallel to [010].
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.493 Å | (50) |
| 2.916 Å | (100) |
| 2.836 Å | (50) |
| 2.678 Å | (40) |
| 2.601 Å | (50) |
| 2.165 Å | (30) |
| 2.117 Å | (40) |
| 1.881 Å | (30) |
| 1.626 Å | (30) |
| 1.590 Å | (50) |
| 1.421 Å | (30) |
Comments:
Val Graveglia, Liguria, Italy. Data are from Bonazzi et al. (1990).
Geological EnvironmentHide
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Type Occurrence of Piemontite-(Sr)Hide
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General Appearance of Type Material:
Small prismatic crystals, up to 0.5 mm, in veinlets about 3-4 mm thick, that cut black manganese ore.
Place of Conservation of Type Material:
Museo di Mineralogia dell'Università di Firenze.
Geological Setting of Type Material:
Low-temperature metamorphic rocks.
Associated Minerals at Type Locality:
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
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Other Language Names for Piemontite-(Sr)Hide
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Relationship of Piemontite-(Sr) to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Piemontite-(Sr)Hide
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References for Piemontite-(Sr)Hide
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Reference List:
Bonazzi, Paola, Menchetti, Silvio, Palenzona, Andrea (1990) Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy, 2 (4) 519-523 doi:10.1127/ejm/2/4/0519
Armbruster, Thomas, Bonazzi, Paola, Akasaka, Masahide, Bermanec, Vladimir, Chopin, Christian, Gieré, Reto, Heuss-Assbichler, Soraya, Liebscher, Axel, Menchetti, Silvio, Pan, Yuanming, Pasero, Marco (2006) Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18 (5) 551-567 doi:10.1127/0935-1221/2006/0018-0551
NAGASHIMA, Mariko, ARMBRUSTER, Thomas, AKASAKA, Masahide, MINAKAWA, Tetsuo (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 (3) 142-150 doi:10.2465/jmps.090709
NAGASHIMA, Mariko, SANO, Yuko, KOCHI, Takako, AKASAKA, Masahide, SANO–FURUKAWA, Asami (2020) Crystal chemistry of Sr–rich piemontite from manganese ore deposit of the Tone mine, Nishisonogi Peninsula, Nagasaki, southwest Japan. Journal of Mineralogical and Petrological Sciences, 115 (5) 391-406 doi:10.2465/jmps.191122
Localities for Piemontite-(Sr)Hide
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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
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.