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Descloizite is a rare mineral species consisting of basic lead and zinc vanadate, (Pb, Zn) 2 VO 4, crystallizing in the orthorhombic crystal system and isomorphous with olivenite. [5] Appreciable gallium and germanium may also be incorporated into the crystal structure.
Recognizing the habit can aid in mineral identification and description, as the crystal habit is an external representation of the internal ordered atomic arrangement. [1] Most natural crystals, however, do not display ideal habits and are commonly malformed. Hence, it is also important to describe the quality of the shape of a mineral specimen:
Scotlandite occurs as chisel-shaped or bladed crystals elongated along the c-axis, with a tendency to form radiating clusters. Its crystals are characterized by the {100}, {010}, {011}, {021}, {031}, and {032}. faces. Scotlandite shows perfect cleavage along the {100} plane and a less good one along the {010} plane. The measured density is 6.37 ...
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Raygrantite is a colorless, transparent mineral that occurs in bladed crystal structures. [2] This bladed structure has striations parallel to the C-axis. [1] Its luster is vitreous, which means it looks similar to glass. Raygrantite on the Mohs hardness scale is a three, which is .5 softer than a penny.
Kyanite also shows a parting on {001} at an angle of about 85 degrees to the long axis of the crystal. [7] Cleavage surfaces typically display a pearly luster. The crystals are slightly flexible. [6] Kyanite's elongated, columnar crystals are usually a good first indication of the mineral, as well as its color (when the specimen is blue).
Bladed olivine crystals are visible, though spinifex texture is weak or absent in this sample. Magmas of komatiitic compositions have a very high melting point , with calculated eruption temperatures up to, and possibly in excess of 1600 °C.
It crystallizes in the monoclinic system, usually as long prismatic crystals showing a diamond-shaped cross section, but also in fibrous, bladed, acicular, columnar, and radiating forms. Its Mohs hardness is 5.0–6.0, and its specific gravity is 3.0–3.4.