druse

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druse

(drōōz)
n. pl. dru·sen (drōō′zən)
One of the small hyaline or colloid bodies sometimes occurring behind the retina of the eye.
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In the central part of the quarry, outside the main mineralized zone, some cavities are lined by colorless or bluish drusy quartz with individual crystals reaching about 1 cm.
The specimens are open geodes from 5 to 20 cm across, lined by drusy calcite, each geode sporting one or two very sharp individual calcite crystals, the latter ranging up to 6 cm.
At the Brown Monster mine, groups of brown bladed fornacite (to 0.4 mm) are relatively uncommon and are found on drusy quartz or lining fractures in marble.
Associated species include drusy milky quartz and corroded, octahedral galena crystals.
However, the names Frizington, Egremont and Cleator Moor immediately conjure images of fabulous, classic barite, calcite and fluorite crystal clusters, mammillated to reniform hematite "kidney ore" specimens, and beautiful, lustrous, colorless to smoky quartz crystals of a stout habit on sparkling drusy hematite.
Here a more complex mineralogy, affected by an intense process of dissolution and recrystallization, includes microcline, albite, albitized microcline, altered hydrous micas, and sometimes small pockets lined with drusy quartz.
Nearly all datolite specimens are found as drusy plates of whitish to pale green crystals up to 1.3 cm completely lining cavities.
The fluorite only appeared later, in about 2004, and then was not really appreciated until the drusy quartz coatings on the fluorite crystals were chemically removed.
In matrix pieces ranging between 5 and 25 cm across, bright lime-green and yellow-orange hemispheres of curved, tightly intergrown crystals (the "campylite" habit) reaching 1 cm in diameter rest on seams in quartzite, or are implanted on drusy quartz in vugs.
The blocky crystals often have a drusy coating of pyrite, and commonly appear to be parasitic growths on polybasite.
El Cobre scorodite specimens, found in a single pocket in1968 (usually on white drusy quartz--the one shown here is unusual),are widely considered to be the finest examples of the species.
Small, elongated crystals of gold to more than 1 cm occur on drusy quartz at the Emperor mine, and are found intergrown with sylvanite and pyrite in the Loloma mine (adjacent to the Emperor mine).