Oxides and hydroxides: Senarmontit
Diagnostic Card.
Sb 2 O 3
Crystal system cubic
Hardness
Specific gravity 5.3
Cleavage imperfect
fracture conchoidal
Color from colorless to gray
Color white powder
Gloss resin
As arsenic oxide, antimony oxide exists in two forms. The first structural modification - senarmontit - arsenolitu similar in structure. It is represented by a beautiful quite large (up to 3 cm), perfect octahedral crystals form. Their color is greyish-white and gray. The second structural modification - Valentine -has rhombic crystals, whitish-gray and yellowish color. Most often found in the form of dense, earthy and lamellar-fibrous masses.
Origin.
This mineral is formed by the oxidation of stibnite antimony and other minerals.
Place of Birth.
Senarmontit occurs primarily in Algeria (Hamimat mine near the city of Constantine), where he is a product of the oxidation of stibnite and associated with other secondary minerals antimony; Field is located among the shale. In Europe, this mineral is found in many places, including such as Nedtsoris in Sardinia, Tuscany and shove in Arnsberg in Westphalia. In Mexico, in Arecibo (near Chihuahua) found numerous instances valentinita in association with native antimony and kermezitom.
Senarmontit. Hammimat Algeria. Crystals to 1.5 cm Photo:. © AA Evseev.
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