Calcite - Specimen lock Mined from: Sierra De Cruces

Mined from: Sierra De Cruces

The piece shows a distinct side profile with exposed upper and lower teeth still set in the jaw

It shows the broad flat faces and sharp angles topaz is known for

The proper name for this process is called "agatized coral" or "agatized fossil coral

giving it the classic bird-like theropod shape associated with Grallator tracks

Calcite - Specimen lock Mined from: Sierra De CrucesMined from: Linwood Mine, Buffalo, Scott County, Iowa Description: A striking, one of a kind calcite specimen featuring a dense cluster of sharply formed, blocky crystals elegantly spread across a limestone matrix. This piece showcases classic Midwestern U. S. calcite morphology, with well defined rhombohedral to pseudo cubic crystal habits that create a visually captivating, geometric landscape. The crystals range from transparent to softly