Oxides and hydroxides: octahedron (Anatase)
Diagnostic Card.
Ti O 2 (titanium oxide)
Crystal system tetragonal
Hardness of 5.5-6
The proportion of 3.8-4
Cleavage is perfect
fracture polurakovisty
Color from yellow to black
Powder color light yellow
Luster of diamond to metal
Its crystals are always small size (typically 1-3 mm), but excellent shape, have peaked bipyramidal form. Sometimes complicated by other small faces. More rare tabular or obtuse bipyramidal crystals. Color - from light yellow to apple sapphire blue and black. Translucent or transparent; shine quite bright; its refractive index is very high - even higher than that of diamond.
It is known only in the form of small, randomly overgrown crystals. The crystalline forms often ostrobipiramidalnye rounded - or tupobipiramidalnye, often in the form oktaedropodobnyh, blue or dark red tetragonal bipyramid. Cleavage is perfect in two directions; density of 3.8 - 3.9: bluish-black, honey-yellow, brown, red and blue silk, rarely colorless.
Anatase name from the Greek. "Length" (the longest tetragonal crystals; RJ Haüy, 1801). Known since 1738, the French chemist N.L.Voklen (1802) proved the identity of its members with rutile.
Diagnostic features.
Since anatase generally well crystallized, the appearance of its crystals almost does not allow confusion with other minerals. Do not melt. Behavior in acids. Insoluble.
Origin.
The mineral is quite rare, but typical of the Alps. Presented in the cracks in the gneisses and schists, together with quartz, titanite, adularia, hematite and other minerals. The mineral is of hydrothermal origin, filling cracks near the alpine rock crystal and adularia, bright yellow crystals (Switzerland, France); new finds dark blue anatase on quartz made in Southern Norway. Free crystals and gold placers in the sands of the Urals (Russia). Microscopic specks of anatase are found in many rocks.
Deposits and application.
Magnificent anatase crystals found in the Ossola near Punta d'Arbola (Ofenhorn). Satisfactory specimens were observed in Val Formaze in Beure near Domodossola, in a cave among the gneisses, in association with the brookite. Sometimes anatase titanium ore is mined like. For anatase titanium tangible irrelevant.
- Gatchell - "New Almadén snag" - arsenide and antimony sulfide (modern sulphosalts)
- Antimony - toxic metal (semi-metal) are widely used in industry, medicine and engineering
- Zirconium - a rare and non- metal and dangerous jewel in the oxide and salts
- Gold - yellow dangerous and toxic metal -date and accurate digital cable technology
- Sulphur - a golden-yellow toxic substance and a sign of volcanic activity
- Cadmium - a toxic uncirculated unknown wide range of people silvery metal
- Lead - a poisonous gray simulator silver metal and toxic metal snag
- Arsenic - poison classic medieval and modern poisoners and medicine in medicine
Toxic and hazardous radioactive rocks and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity)
** - Radioactive rocks and minerals (obligatory check on a regular dosimeter + ban on the open sale of radioactivity in the event of more than 24 mR / hour + additional measures to protect the population)
Catalog minerals and gems in groups of the world
** - Poisonous stones and minerals
** - Radioactive rocks and minerals
Comments
Commenting, keep in mind that the content and the tone of your messages can hurt the feelings of real people, show respect and tolerance to his interlocutors, even if you do not share their opinion, your behavior in terms of freedom of speech and anonymity offered by the Internet, is changing not only virtual, but real world. All comments are hidden from the index, spam control.