Possible jade
Harder than steel and a density of about 2.7-3 (very rough measurement) so they're not serpentine. They also don't look like chalcedony (chert, jasper or agate) found there. If anyone can tell, let me know, please.
These were actually found at Russian Gulch Beach, but still on the Sonoma Coast
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It looks like the two on the right are probably nephrite jade that was once botryoidal; the far left is jasper.
Possible jade
Harder than steel and a density of about 2.7-3 (very rough measurement) so they're not serpentine. They also don't look like chalcedony (chert, jasper or agate) found there. If anyone can tell, let me know, please.
These were actually found at Russian Gulch Beach, but still on the Sonoma Coast
******
It looks like the two on the right are probably nephrite jade that was once botryoidal; the far left is jasper.