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Langgan (Chinese: 琅玕) is the ancient Chinese name of a gemstone which remains an enigma in the history of mineralogy; it has been identified, variously, as blue-green malachite, blue coral, white coral, whitish chalcedony, red spinel, and red jade.
Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
The red variety of chalcedony has been known to be used as beads since the Early Neolithic in Bulgaria. The first faceted (with constant 16+16=32 facets on each side of the bead) carnelian beads are described from the Varna Chalcolithic necropolis (middle of the 5th millennium BC). [ 5 ]
The carnelian is a siliceous stone and a species of chalcedony. Carnelian is a flesh-hued red, varying from the palest flesh-color to a deep blood-red. It is of a conchoidal structure. Normally its color is without clouds or veins; but sometimes delicate veins of extremely light red or white are found arranged much like the rings of an agate.
Pietersite is a commercial term for a variety of the mineral chalcedony. Originating from Namibia and China, where it is mined for use as a decorative stone due to its chaotic chatoyancy and brecciated structure. Ranging in colour from brownish-red, to blue-grey, and chatoyant yellow.
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Here are the first two letters for each word: ST. SO. MA. GL. FI. SH. PU (SPANGRAM) NYT Strands Spangram Answer Today. Today's spangram answer on Wednesday, January 29, 2025, is PUPPETMASTER.
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