Margarodite, Margarite

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Locality: Old Mine Park (Lane’s Mine of Trumbull; Hubbard Mine; Long Hill Mine; Old Tungsten Mine), Trumbull, Fairfield Co., Connecticut, USA

Note: The mineral species Margarodite is not listed in our database for this locality. This specimen may be misidentified or the mindat list of minerals at this locality may be incomplete.

Polished specimen of margarodite pseudomorph after a large topaz crystal from one of the greisen-like (pseudogreisens, as I fondly call them) hydrothermal veins in Old Mine Park, Trumbull, Connecticut. The topaz crystal has been completely altered to a porcellaneous mixture of micas. It is interesting to note that XRF analyses of this material performed by the photographer have indicated that samples of pseudomorphosed topaz from Trumbull show detectable amounts of both Rb and Sr, while samples of topaz from hydrothermal veins that do not show signs of alteration only contain detectable amounts of Rb. I theorize that substitution of Ca for Sr in the margarite contained in this sample is responsible for its elevated strontium concentration. Since samples from other hydrothermal veins contain little margarite, they do not show elevated levels of Sr.

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Photo added: 1st May 2009

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. 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. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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