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It forms as white, green to reddish tabular monoclinic tectosilicate crystals with a Mohs hardness of 3.5 to 4 and a specific gravity of 2.1 to 2.2. It commonly occurs as a devitrification product of volcanic glass shards in tuff and as vesicle fillings in basalts, andesites and rhyolites.
It often occurs as thin tabular crystals with a bright orange-red to yellow-orange color, sometimes brown, although the color can be highly variable. In its yellow form it is sometimes called "yellow lead ore". It crystallizes in the tetragonal system, often occurring as stubby, pyramidal or tabular crystals. It also occurs as earthy, granular ...
Pyrrhotite generally displays massive to granular crystal habit, and may show tabular/prismatic or hexagonal crystals which are sometimes iridescent. [ 14 ] Diagnostic characteristics in hand sample include: brassy/bronze color with a grey/black streak, tabular or hexagonal crystals which show iridescence, subconchoidal fracture , metallic ...
Abernathyite is a transparent, yellow mineral that occurs as tabular crystals up to 3 millimeters (0.12 in). The mineral has a single perfect cleavage on . Abernathyite fluoresces yellow-green in longwave and shortwave ultraviolet. [4] Because of its uranium content, the mineral is radioactive. [5]
Hydroxyapatite crystals are also found in pathological calcifications such as those found in breast tumors, [8] as well as calcifications within the pineal gland (and other structures of the brain) known as corpora arenacea or "brain sand". [9]
Treatment is often largely dependent on the type of cyst. Asymptomatic cysts, termed pseudocysts , normally require active monitoring with periodic scans for future growth. [ 7 ] Symptomatic (producing or showing symptoms) cysts may require surgical removal if they are present in areas where brain damage is unavoidable, or if they produce ...
Diaboleite is deep blue in color and pale blue in transmitted light. The mineral occurs as tabular crystals up to 2 cm (0.8 in) in size, as subparallel aggregates, or it has massive habit. Vicinal forms of the tabular crystals have a square or octagonal outline and rarely exhibit pyramidal hemihedralism. [2]
Lawsonite is a metamorphic silicate mineral related chemically and structurally to the epidote group of minerals. It is close to the ideal composition of CaAl 2 Si 2 O 7 (OH) 2 ·H 2 O giving it a close chemical composition with anorthite CaAl 2 Si 2 O 8 (its anhydrous equivalent), yet lawsonite has greater density and a different Al coordination (Comodi et al., 1996).