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The OED defines pyrope (from Greek Πυρωπός, lit. "fire-eyed")" as: "In early use applied vaguely to a red or fiery gem, as ruby or carbuncle; (mineralogy) the Bohemian garnet or fire-garnet"; and carbuncle or carbuncle-stone (from Latin "carbunculus", "small glowing ember") as: "A name variously applied to precious stones of a red or ...
Schistostega pennata, also called goblin gold, [1] Dragon's gold, [2] luminous moss [1] or luminescent moss, [3] is a haplolepideous moss known for its glowing appearance in dark places. It is the only member of the family Schistostegaceae .
In contrast, common opal does not display an iridescence, but often exhibits a hazy sheen of light from within the stone – the phenomenon that gemologists strictly term as opalescence. [5] This milky sheen displayed by opal is a form of adularescence .
The visible absorption spectrum of scheelite, as seen by a hand-held (direct-vision) spectroscope, may also be of use: most natural stones show a number of faint absorption lines in the yellow region of the spectrum (~585 nm) due to praseodymium and neodymium trace impurities. Conversely, synthetic scheelite is often without such a spectrum.
His gravel driveway has been forged into a blanket of smooth, blackened stones. On either side, piles of community organizing supplies are melted, unrecognizable. A stack of metal poles used to be ...
A sett, also known as a block or Belgian block, [1] is a broadly rectangular quarried stone used in paving roads and walkways. [ 2 ] [ 3 ] Formerly in widespread use, particularly on steeper streets because setts provided horses' hooves with better grip than a smooth surface, they are now encountered more usually as decorative stone paving in ...