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Piemontite-(Sr) Mineral Data
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General Piemontite-(Sr) Information
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 Chemical Formula: |
(Ca,Mn++)(Sr,Ca)Mn+++(Al,Mn+++,Fe+++)2(SiO4)(Si2O7)O(OH) |
| Composition: |
Molecular Weight = 524.43 gm |
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Strontium 11.70 % Sr 13.83 % SrO |
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Calcium 8.41 % Ca 11.76 % CaO |
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Manganese 11.52 % Mn 2.71 % MnO / 13.55 % Mn2O3 |
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Aluminum 9.26 % Al 17.50 % Al2O3 |
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Iron 3.19 % Fe 4.57 % Fe2O3 |
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Silicon 16.07 % Si 34.37 % SiO2 |
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Hydrogen 0.19 % H 1.72 % H2O |
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Oxygen 39.66 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.8Mn2+0.2Sr0.7Ca0.3Al1.8Mn3+0.9Fe3+0.3Si3O12(OH) |
| Environment: |
As veinlets in a low-temperature metamorphosed manganese ore deposit. |
| IMA Status: |
Approved IMA 1990 - Dana # changed from 58.2.1a.12 |
| Locality: |
From the Molinello and Cassagna manganese mines, near Chiavari, Val Graveglia, Liguria, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
From its strontium content and similarity to piemontite. |
| Name Pronunciation: |
Piemontite-(Sr) + Pronunciation  |
| Synonym: |
IMA1989-031 |
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Strontiopiemontite - Renamed to Piemontite-(Sr) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567. |
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