🔎 UNIDENTIFIED Calcite?

[routefood]

Saw this lying on a client's coffee table. Thinking it was manufactured, I asked her about it. She said it was real and came from Colorado. Some sort of Calcite, she said.

 

[ToddsPoint]

A very nice specimen!

 

[galenrog]

From images alone, it appears to be calcite.

 

[Mackaydon]

Calcite: Brought back a memory of TH-ing on Swan Island (Honduras). Had a great signal and broke through a two inch layer of calcite; signal went dead (machine was ok). I keep a piece of that calcite as a reminder of the adventure.
Don in SoCal