File:Chabazite-Ca-Heulandite-Ca-pas-61b.jpg

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Chabazite-Ca-Heulandite-Ca-pas-61b.jpg (400 × 335 pixels, file size: 34 KB, MIME type: image/jpeg)

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Description
English: Chabazite-Ca, Heulandite-Ca
Locality: Jones Falls Quarries, Baltimore, Baltimore County, Maryland, USA (Locality at mindat.org)
Size: cabinet, 16.6 x 9.2 x 3.7 cm
Chabazite var. Haydenite with Heulandite
A large specimen hosting dozens of sharp chabazite crystals showing a golden, iridescent, almost metallic lustre. Although small, to about 2mm, the crystals really stand out dramatically because of their sharp geometry and riveting color - more so in person, please note. The earliest reference I found to this quarry was Maryland Geologic Survey, Vol. VIII (1898), as listed on MINDAT, which describes the locality as "A quarry in gneiss located within Baltimore City." This matrix shows the layered gneiss on the backside with the layer of zeolite deposition on top, and so the full environment of the pocket is here. The heulandite is present as almost acicular, oddlooking black sprays laying horizontally on the matrix, much of which is coated with a thin layer of siderite or calcite atop (I think). It is easy to see, from the odd habits of both species, why the specimens from this quarry were thought to be new species at the time: "Haydenite" is Chabazite; and "Beaumontite" is Heulandite, today. Can easily be broken into several study specimens, by the way.
Deutsch: Chabasit-Ca, Heulandit-Ca
Fundort: Jones Falls Quarries, Baltimore, Baltimore County, Maryland, Vereinigte Staaten (Fundort bei mindat.org)
Größe: 16.6 x 9.2 x 3.7 cm
Date before March 2010
date QS:P,+2010-03-00T00:00:00Z/7,P1326,+2010-03-00T00:00:00Z/10
Source Image: http://www.irocks.com/db_pics/pics/pas-61b.jpg, Description: http://www.irocks.com/render.html?species=Heulandite-Ca&page=8
Author
Robert M. Lavinsky  (1972–)  wikidata:Q56247090
 
Alternative names
Robert Matthew Lavinsky; Lavinsky, Robert M.; Lavinsky R M
Description American mineral collector and mineral dealer
iRocks.com (Mineralogical Record)
Date of birth 13 December 1972 Edit this at Wikidata
Location of birth Columbus Edit this at Wikidata
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creator QS:P170,Q56247090
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Rob Lavinsky, the copyright holder of this work, hereby publishes it under the following license:
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Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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