Hematite-included colorless calcite druzy Petrified wood I suspect the black mineral

I suspect the black mineral could be poorly-formed specularite hematite

and can be colorless to semi-translucent white with inclusions

when viewed from the side you see it is actually two twinned dolomite snowflakes

There are some very small calcite crystals sprinkled on the piece

Approx weight: 382g

Hematite-included colorless calcite druzy Petrified wood I suspect the black mineralLocale: Santa Eulalia, Chihuahua, Mexico Approx dimensions: 4 x 3 x . 75" Approx weight: 101g This calcite specimen from Santa Eulalia is coated with well formed colorless calcite druzy, with fine red tinted hematite inclusions inside. This gives the crystals a brick red tint softened by the glittery clear surface. This specimen is a thin crust of ferrous (iron based) matrix with dusty red oxidation on the back. The front is completely covered in