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| Description | |
|---|---|
| Quality of samples: | Rock forming mineral/non-crystalline/little interest for collectors.(##) |
| Rarity at site: | Extremely common |
| Confirmation | |
| Validity: | Believed Valid |
| References | |
| References: | AmMin 20(1):1-24 |
| Data | |
| Mineral Data: | Click here to view Perthite data |
| Locality Data: | Click here to view Rollstone Hill Quarry, Fitchburg, Worcester Co., Massachusetts, USA |
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