Polished Desert Sunset slab DS175 dendrites The matrix that this copper

The matrix that this copper based mineral forms on is kaolinite

Porphyry is a general term that is used rather loosely for  igneous rocks which contain relatively large isolated crystals set in a fine-grained groundmass

From near Paraburdoo

The amphibolite

Highly polished on both sides

Polished Desert Sunset slab DS175 dendrites The matrix that this copperDS174 Desert Sunset slab, polished on one side . Dimensions at widest points approximately 135 mm x 120 mm x 10 mm thick. Weighs 303 grams. Desert Sunset is a banded iron formation that is comprised of alternating layers of red and yellow jasper and chert with narrow bands of black hematite. It comes from near Fields Find, a small abandoned gold mining centre in the Midwest region of Western Australia.