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Chlorastrolite
A variety of Pumpellyite-(Mg)
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About Chlorastrolite
Formula:
Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Name:
Green star stone. First discovered on Isle Royale, Lake Superior by C. T. Jackson and J. D. Whitney in 1847.
Chatoyant and generally exhibits a distinctive and attractive mosaic or segmented pattern, sometimes referred to as "turtleback". State gemstone of Michigan.
Originally described from Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA.
Visit gemdat.org for gemological information about Chlorastrolite.
Originally described from Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA.
Visit gemdat.org for gemological information about Chlorastrolite.Unique Identifiers
Mindat ID:
11469 (as Chlorastrolite)
3309 (as Pumpellyite-(Mg))
3309 (as Pumpellyite-(Mg))
Long-form identifier:
mindat:1:1:11469:1 (as Chlorastrolite)
mindat:1:1:3309:7 (as Pumpellyite-(Mg))
mindat:1:1:3309:7 (as Pumpellyite-(Mg))
Chemistry of Chlorastrolite
Mindat Formula:
Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Element Weights:
Synonyms of Chlorastrolite
Other Language Names for Chlorastrolite
German:Chlorastrolit
Spanish:Clorastrolita
Common Associates
Associations Based on Photo Data:
| 4 photos of Chlorastrolite associated with 'Greenstone' | |
| 3 photos of Chlorastrolite associated with Thomsonite-Ca | NaCa2[Al5Si5O20] · 6H2O |
| 2 photos of Chlorastrolite associated with Calcite | CaCO3 |
| 1 photo of Chlorastrolite associated with Native Copper | Cu |
| 1 photo of Chlorastrolite associated with Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 1 photo of Chlorastrolite associated with Quartz | SiO2 |
| 1 photo of Chlorastrolite associated with Analcime | Na(AlSi2O6) · H2O |
| 1 photo of Chlorastrolite associated with Pumpellyite-(Mg) | Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH) |
Other Information
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 Chlorastrolite
mindat.org URL:
https://www.mindat.org/min-11469.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Chlorastrolite
Localities for Chlorastrolite
Showing 20 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
USA | |
| Locality description Centennial Mine |
| Locality description Centennial Mine | |
| USGS PP144 |
| |
| Bornhorst et al. (2011) |
| Heinrich et al. (2004) |
| Yalmer Primeau collection | |
| Personally collected by Paul Brandes in ... |
| Bornhorst et al. (1994) |
| Heinrich et al. (2004) |
| Heinrich et al. (2004) |
| Heinrich et al. (2004) | |
| Heinrich et al. (2004) | |
| |
| self collected at site | |
| Ransom (1974) |
| Heinrich et al. (2004) | |
| Heinrich et al. (2004) | |
| Heinrich et al. (2004) |
Phoenix Mine, Phoenix, Houghton Township, Keweenaw County, Michigan, USA