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GeneralPocket reconstruction at Cranbrook Institute of Science

17th Jul 2015 14:49 UTCLarry Maltby Expert OP

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While going through my archive of old color slides, I came across these interesting pictures that I photographed at the Cranbrook Institute of Science in 1974. They show a display in the mineral room that reconstructs the environment where amazonite, smoky quartz and phenakite crystals form. It is an attractive and interesting display that I don’t think was intended to be an accurate representation of a specific pocket. I noticed that the phenakite sitting on the amazonite crystal is attached with mineral tack. That made me wonder about the three phenakites that are attached to the smoky quartz crystal in the background. Have any of you ever seen a natural smoky quartz, phenakite combination as good as that?


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Pocket reconstruction, Cranbrook Institute of Science, 1974
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Pocket reconstruction, Cranbrook Institute of Science, 1974
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Pocket reconstruction, Cranbrook Institute of Science, 1974

17th Jul 2015 15:34 UTCWilliam C. van Laer Expert

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Not as large but even more interesting: a prismatic phenakite on smoky quartz with an etched topaz crystal, minor albite, from the Upper Cramer Lake area, Sawtooth Mountains, Idaho.

17th Jul 2015 17:01 UTCLarry Maltby Expert OP

Thanks for showing your specimen, William. That is really a well formed crystal and a great combination of minerals. I looked at all of the Colorado smoky quartz specimens shown on Mindat and found only one that had a poorly crystallized phenakite attached. If the one at Cranbrook is a natural specimen, I would replace it in the pocket restoration and show it in a more prominent position.

17th Jul 2015 17:47 UTCDon Saathoff Expert

Hello Larry,


In my mind the key word in that display is "restoration" so even if the phenakite attachment is not natural but can present in that manner, the display is acceptable.


Don

17th Jul 2015 18:31 UTCLarry Maltby Expert OP

I agree Don. I can remember when I visited Cranbrook; I would spend a lot of time looking at that case. It made an impression. Almost as if I had just uncovered the pocket myself and was beginning to pluck out the specimens. I was just thinking that if the smoky quartz with the attached phenakites is natural (and it well may be) that it would be a killer!
 
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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