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Hornblende has a hardness of 5–6, a specific gravity of 3.0 to 3.6, and is typically an opaque green, dark green, brown, or black color. It tends to form slender prismatic to bladed crystals, diamond-shaped in cross section, or is present as irregular grains or fibrous masses.
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 ...
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:
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).
Okenite (CaSi 2 O 5 ·2H 2 O) [3] is a silicate mineral that is usually associated with zeolites.It most commonly is found as small white "cotton ball" formations within basalt geodes.
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.
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.
The mineral may occur as crystals, or as masses or concretions. [5] The crystals are usually prismatic parallel to the c-crystal axis, and flattened perpendicular to the b-axis. Equant crystals are rarer. [2] [3] [5] They may also occur as stellate (star-shaped) groups, or encrustations with a bladed or fibrous structure. [5]