Carbonates: Aurichalcite
Diagnostic card.
(Zn, Cu) 5 (CO 3 ) 2 (OH) 6
Diamond orthogonality
Hardness 2
Specific weight 3,6-4,3
Cleavage perfect along plates
Fracture leafy
Blue color
Powder in color from white to pale blue
Shine from silky to pearly
The aurichalcite, or brass flower, as it was once called, occurs in the form of efflorescences from needle crystals or in the form of crusts of a fibrous-lamellar structure. The color is pale green with a tendency to bluish. Pale green to greenish-blue and sky-blue.
Chemical composition - content (in%): CuО - 17,9-29,4; ZnO - 45.7-54.8; CO2 - 12 - 16.5; H2O-8.5 to 11.1. Cleavage - on {010} perfect. Aggregates - Found in the form of thin needles or flattened-elongated crystals elongated in [001]; Also in the form of pencil-shaped or pinnate crusts; Rarely columnar, leafy or granular. The crystals are flattened along {010} and covered with hatching or grooves along [001]; A series of step faces {h0l} forms a wedge-shaped end on the crystals.
Diagnostic signs.
Reacts with hydrochloric acid with clear effervescence. Does not melt. In the close. Tr. Loses H2O and turns black. Behavior in acids - Soluble in acids and ammonia.
Origin.
The mineral has a secondary origin, formed as a result of changes in the minerals of zinc and copper under the influence of carbonate-containing waters. Occurs in the oxidation zone of copper-zinc deposits.
Place of Birth.
Aurichalcite is found in the zinc mines of Monteponi in Iglesias and Rosas near Sulchis in Sardinia. They are celebrated in Camisolo and Primalun (province of Como) and in Camquilla (Tuscany). A wonderful mineral for collecting.
He meets in Tsumeb and Minduli in Namibia, in Cessi near Lyons in France, in the Bisbee ore zone (Arizona), in many places in Cumberland and Derbyshire (England).
Aurichalcite. Yang-Kubanza \ Yanga-Koubanza, HP Congo. Photo: © А.А. Evseev.
Aurichalcite (on lithospheric kimberlite). Mapimi, Durango, Mexico. 8х5 cm. Photo: © А.А. Evseev.
Aurichalcite, hydrozincite (white). Mine (mine). Hilarion, Lavrion, Greece, the EU. Photo: © А.А. Evseev.
Aurichalcite. Semenovsky District, Altai, Russia, the CIS. More than 12 cm. Photo: © А.А. Evseev.
- Ghetchellit - "New Almaden blend" - arsenide and antimony sulfide (modern sulfosol)
- Antimony is a toxic metal (semimetal) , widely used in metallurgy, medicine and engineering
- Zirconium - a rare and undiscovered metal and the most dangerous precious stone in oxide and salt
- Gold - yellow dangerous and poisonous metal of modern accurate digital and cable technologies
- Sulfur is a golden-yellow toxic substance and a sign of active volcanic activity
- Cadmium is an undisputed toxic silvery metal unknown to a wide range of people
- Lead - a toxic gray imitator of metallic silver and toxic metal blende
- Arsenic is a classic poison of medieval and modern poisoners and medicine in medicine
Poisonous and radioactive dangerous stones and minerals
** - poisonous stones and minerals (mandatory check in the chemical laboratory + explicit indication of toxicity)
** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
Comments
When commenting on, remember that the content and tone of your message can hurt the feelings of real people, show respect and tolerance to your interlocutors even if you do not share their opinion, your behavior in the conditions of freedom of expression and anonymity provided by the Internet, changes Not only virtual, but also the real world. All comments are hidden from the index, spam is controlled.