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Agate Beads
Agate is a variety of translucent Chalcedony ranging in many colors due to mineral inclusions.
Latest update: 2025 April 18
Pyrolusite
(Mineral)
Pyrolusite Is a member of the Rutile Group of very bright acicular (needle-shaped) crystals. It is a black or dark gray mineral with a metallic luster, consisting of manganese dioxide. It was named in 1827 from pyro- ‘fire, heat’ + Greek lousis ‘washing’ because of the mineral's use in decolorizing brown and green tints in glass making. Pronunciation: piro-lo-sit
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