Mystery Mineral in Tabletop Fountain

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The discussion centers on identifying a crystal that formed after water evaporated from a tabletop fountain made of glued rocks. The crystal is described as off-white and slightly straw-colored, with an image provided that is twice the actual size. Participants are encouraged to consider conducting a qualitative analysis using available reagents or suggest using an x-ray diffractometer for more precise identification of the mineral.
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This crystal was left over after the water in a tabletop foundation evaporated. The fountain is a collection of rocks glued together that the water tumbles over.

The crystals are off-white, slightly straw-colured. The image is about 2X actual size.

Any idea what the mineral may be?
 
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Looks like there may be enough there to do a rough qualitative analysis...if you have access to reagents. Or, would you happen to have an x-ray diffractometer handy ?
 

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