margarite

A rock formation that resembles beads, found in glassy igneous rocks.

A pearl.

A pearl.

A mineral of micaceous structure, separable into thin laminæ which are rather brittle.

In lithology, an arrangement of the devitrification products (globulites) of a glassy material into forms resembling strings of beads: a term introduced by Vogelsang.

Same as margarita, 1.

A pearl.

A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster.

A calcium-rich member of the mica group of phyllosilicates, forming white to pinkish or yellowish-gray masses or thin laminae.

pearl