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Lavendulan is a blue or greenish blue translucent mineral, with a vitreous to waxy luster, satiny in aggregates, and a light blue streak. It occurs as thin botryoidal crusts of minute radiating fibers or as thin rectangular, pseudo-orthorhombic plates, with cleavage in three directions, nearly perfect perpendicular to the b crystal axis, [ 4 ...
Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux , meaning "light", and generally implies radiance, gloss, or brilliance.
Satin spar, less commonly atlas spar, is a trivial, partly obsolete name for fibrous varieties of two minerals, gypsum and calcite, [1]: 40 possessing a characteristic silky luster. Despite their very low hardness (2 or 3 on the Mohs scale ), both atlas (satin) spars (especially selenite ) are widely used as ornamental stones.
Satin was originally made solely of silk, which, for much of history, was produced and found mainly in China. [3] In ancient [clarify] China, various forms of satin fabrics existed, which came under several names, such as duan (缎), zhusi (紵丝), ling (绫), jin (锦), wusi (五丝) and basi (八丝). [4]
Fatimid Luster Plate with Cock Fight. Cairo, 11th–12th century. Keir Collection of Islamic Art. Some Abbasid lustreware can be differentiated by figural vs. vegetal design where some include icons and others show plant life. [24] Some displayed both plants and figures.
Ulexite (/ juː ˈ l ɛ k s aɪ t /) sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB 5 O 6 (OH) 6 ·5H 2 O.
Luster: light reflection creates a signature appearance Performance: colorfast to perspiration staining, colorfast to dry cleaning, air and vapor permeable Tenacity: weak fiber with breaking tenacity of 1.2 to 1.4 g/d; rapidly loses strength when wet
Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks.It also occurs as a product of metamorphism of magnesium-rich limestones.