Judging quality
Greener and usually more translucent than turquoise, with a waxy lustre. Much material is stabilised; ask.
Phosphate
A soft apple-green phosphate that looks like green turquoise and forms in the same way, by phosphate-rich water percolating through aluminous rock. Utah nodules with black spiderweb matrix are the prize material.

Greener and usually more translucent than turquoise, with a waxy lustre. Much material is stabilised; ask.
Porous and soft. Keep from oils, perfume and heat.
Named for the Variscia region of Saxony; Neolithic Iberian burials contain variscite beads mined at Gavà near Barcelona.
Cultural history, recorded as tradition rather than as medical or scientific claim.
See it in person
Both rooms are open six days a week, and there is always someone happy to pull pieces out of the case so you can compare them under the light.