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Calcite, Nontronite, Analcime

Calcite : CaCO3, Nontronite : Na0.3Fe2((Si,Al)4O10)(OH)2·nH2O, Analcime : Na2(Al2Si4O12)·2H2O
minID: 4ER-DWX

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An analcime coated vug with a calcite crystal inside. There are balls of nontronite scattered throughout the vug. When the vugs are opened, the nontronite becomes black. But before to air or light, however, the nontronite is blue - as can be seen when it is included in the calcite.

This picture is taken with a Canon MP-E 65.

The calcite crystal is slightly less than 1 mm across vertex to vertex.

This photo has been shown 167 times

Photo added: 26th Dec 2011

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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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