Pyrolusite

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Clusters of splendent, dark gray pyrolusite blades in jackstraw fashion richly fill a vug lined with starkly contrasting white quartz microcrystals on massive pyrolusite matrix on this fine and uncommon specimen from near Cavnic, Romania. Pyrolusite usually forms as matte-black powdery to fibrous crusts, or sometimes in botryoidal or columnar aggregates, so these metallic blades are an uncommon form. Old-time and uncommon material from the Carl Stentz and John Ydren Collections.