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This was found in my garden today and has me completely stumped. What is it?

enter image description here

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    $\begingroup$ en.wikipedia.org/wiki/Desert_rose_(crystal) $\endgroup$ – Universal_learner May 21 '18 at 18:33
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    $\begingroup$ @Universal_learner Only if you put an answer instead of a comment. They're really not interchangeable. $\endgroup$ – Ash May 22 '18 at 15:40
  • $\begingroup$ Can you add where you found it (geography)? $\endgroup$ – Jan Doggen May 28 '18 at 22:08
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It is gypsum, variety selenite, specifically named desert rose. Desert rose is selenite where sand or silt become trapped within the gypsum as the crystals grow.

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