C0009 - Green Gneiss Stone Slab

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We obtained this slab from an estate, so we don't know what it is or where it comes from. Saw one similar image on ye ole inter-google described as follows:

subduction zone: finely crystalline, dense gneiss composed of alternating layers of pale green epidote and black amphibole gneiss; transition from greenschist to amphibolite facies of metamorphism; likely protolith is a Ca-rich ferromagnesium mafic volcanic.

I didn't get me none of that there college learnin', so I gots me no idear what they's a speaching 'bout. But it appears to be generally called Green Gneiss (pronounced nice) but consists of epidote and amphibolite that was layered, compressed and heated to form these cool stripes.

If you look closely, there is a thin silvery vein at the boundary between the dark and light green colors. It doesn't look like metal but suspect it is probably tiny quartz crystals. Definitely an old fracture line in the stone's dark green surface that extends to both sides. Should make a few good cabochons, eh?

Length 3"

Height 2"

Thickness 0.185" (4.7 mm)

Weight 52.5 grams (1.85 oz)