Calcite with brown-red intersecting pyramid druzy Spider jasper Turns out it's hollow like

Turns out it's hollow like a geode and the holes on the front and back connect

but they have the same color as the rest of the piece due to hematite (iron oxide) inclusions dusting their interiors

I’ll admit even with magnification my eyes aren’t good enough to tell what going on here—email me if you know about this material

Chalcopyrite's tarnishing process can occur naturally

GET 20% OFF OF A COPROLITE

Calcite with brown-red intersecting pyramid druzy Spider jasper Turns out it's hollow likeLocale: Santa Eulalia, Chihuahua, Mexico Approx dimensions: 5 x 2. 5 x . 75" Approx weight: 112g This calcite specimen from Santa Eulalia is a lovely deep red color from hematite (iron oxide) inclusions. An irregular shaped piece of matrix is covered in glittering red calcite druzy on both sides, and in cracks on the sides. Studied closely, this piece has well formed crystals with beautiful geometry. The druzy is in fact composed of small intersecting