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[R.U. Sirius]

This unlabelled slab I found in collection I bought recently. It's very translucent, and has mossy green inclusions running throughout, much like some green moss agates (though it feels a bit different in my hands). What throws me off are the pastel reddish/purple areas.

Do any of you recognize this material right off the bat?

[vitzitziltecpatl]

Not ignoring your post - just don't know. Wish I did.

[lithicbeads]

A lot of rough like that in Oregon. The green is an iron color as is the red just a slightly higher concentration.

[vitzitziltecpatl]

Good info as usual from Lithicbeads.

We have a piece here without moss, with red, white, and green all in the same piece. Changes in the percentage of the element giving it color is an interesting bit to consider.

[irockhound]

So many locations with green moss/red.  Another from California is the old Horse Canyon beds.  It's impossible to say it is or isn't but I'm going to lean from elsewhere.  Wish I could give more info.  The moss silhouette reminds me of India Moss Agate I have never gotten any of the Indian with Red though, anyone else know it the India Moss agate also goes to red?

[R.U. Sirius]

Worth noting is that red/purple colouring is diffuse, in patches, and the green mossy pattern appears to have some degree of schistosity to it.

[christos]

i  would consider its green from nickel not iron and reddish from iron

[lithicbeads]

The colors are from iron just different concentrations  and/or reduction states.

[R.U. Sirius]

Could this be hydrogrossular garnet ("transvaal jade")? Cannot show it in photos, but the material just doesn't feel like chalcedony. There's a more waxy feel to it. I'll check the density and come back here.