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Linarite occurs as monoclinic prismatic to tabular crystals and irregular masses. It is easily confused with azurite, but does not react with dilute hydrochloric acid as azurite does. It has a Mohs hardness of 2.5 and a specific gravity of 5.3 – 5.5. Linarite was first identified in 1822.
Well-developed crystals are found at many localities: Knappenwand, near the Großvenediger in the Untersulzbachthal in Salzburg, as magnificent, dark green crystals of long prismatic habit in cavities in epidote schist, with asbestos, adularia, calcite, and apatite; the Ala valley and Traversella in Piedmont; Arendal in Norway; Le Bourg-d ...
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 ...
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 ...
It has tabular crystals and sheaflike or irregular aggregates. [2] Lautenthalite is associated with wroewolfeite, which it tends to overgrow. It is also associated with anglesite, devilline–serpierite, galena, linarite, brochantite and schulenbergite. [3] It forms small singular crystals with a size of up to 0.5 × 0.3 × 0.03 mm. [4]
Diaboleite crystal from a slag occurrence in the Laurium District, Attica, Greece (size: less than 1 mm) 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 .
Eskebornite is a selenide mineral with the formula Cu Fe Se 2. [2] [3] It crystallizes in the tetragonal system and it has a brassy colour.Eskebornite is sometimes found as thick tabular crystals, but is more often found intergrown with other selenides. [4]
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]