Datolite (color change) and Heulandite
Datolite (color change) and Heulandite Datolite (color change) and Heulandite Datolite (color change) and Heulandite
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Datolite (color change) and Heulandite (Ref: 8.1-208)

Prospect Park Quarry, Prospect Park, Passaic County, New Jersey, United States
51mm x 32mm x 28mm
minID: 02F-TGN
Datolite with a strong color change from artificial to daylight, the color goes from a dark olive-green to a yellow-grey. From a remarkable pocket at the classic Prospect Park Quarry locality in 2008, there were not many pieces found. This has contrasting Huelandites with a warm brown color and shows the uncommon color change phenomenon very well. The Datolite is transparent with many faces being very glassy. There is contacting and bruising that can be hidden fairly well by display angle, so not for perfectionists. Overall the condition is equal to the best I have seen from this find, and a cute Northeastern USA oddity.
Data last checked on 20th Sep 2022 - specimen may no longer be available

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See Also

Heulandite on Quartz
Prospect Park, New Jersey, USA
40mm x 28mm x 25mm
Analcime, Pectolite, Datolite
Millington Quarry, Bernards Township, New Jersey, USA
65mm x 45mm x 40mm
Patterson, New Jersey, USA
28mm x 27mm x 27mm
Chabazite on Heulandite
Upper Quarry, New St., Paterson, New Jersey, USA
40mm x 30mm x 20mm
Tobermorite (Group) with Datolite (variety bakerite)
Shijiangshan Mine, Yinwu, Linxi, Ulanhad League, Inner Mongolia Autonomous Region  China
$228 *
51mm x 40mm x 25mm
Bor Pit, Dalnegorsk, Primorskiy Kray, Russia
$223 *
80mm x 45mm x 32mm
Charcas, San Luis Potosi, Mexico
64mm x 60mm x 30mm
Ciamol Alp, Fassa Valley, Trento Province, Trentino-Alto Adige Region, Italy
103mm x 95mm x 56mm
Cavansite, heulandite
Wagholi Quarries, Pune, Maharashtra, India
54mm x 44mm x 28mm
Datolite on Prehnite (optical grade gem crystals)
Lane Quarry, Westfield, Hampden Co., Massachusetts, United States
106mm x 67mm
Bor Pit, Dalnegorsk, Primorskiy Kray, Russia
$198 *
66mm x 58mm x 30mm
Rat's Nest Claim, Custer Co., Idaho, USA
60mm x 50mm x 40mm
Delaware mine, Keweenaw Co., Michigan, USA
57mm x 32mm x 14mm
* price is an approximate conversion and may not be accurate.

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