Oxides and hydroxides: Manganite
Diagnostic card.
MnO (OH)
Singonia monoclinic
Hardness 4
Specific weight 4.3-4.4
Cleavage is perfect
Crack irregular
Color black opaque
Color in powder brownish-black
Glitter metal
Manganite crystals are mostly elongated-prismatic, ending with triangular faces or, in more rare cases, a flat face. The surfaces of the prism faces are usually covered with thick vertical shading. Manganite is also found in the form of aggregates having a beam-like, columnar, stalactite, granular and earthy structure. Crystals often form characteristic curved and bent twins.
Chemical composition. Manganese oxide (MnO) 40.4%, manganese dioxide (MnO2) 49.4%, water (H2O) 10.2%. Transparency. Translucent, in shards shines red. Shingonia. Monoclinic (morphological - rhombic). The shape of the crystals. Columnar, elongated along the c axis, prismatic; The faces are often strongly shaded. Class of symmetry. Prismatic - 2 / m. Cleavage. Perfect by (010), (110). Aggregates. Dense, less granular.
Diagnostic signs.
A manganite powder, placed in a test tube and heated on a flame, emits water, which in the form of fine droplets precipitates in the cold part of the tube. This makes it possible to distinguish manganite from a similarly external pyrolusite, which does not contain water. Does not melt. Associated minerals. Pyrolusite, barite, calcite. Similar minerals. Antimonitis, pyrolusitis. Behavior in acids. It dissolves in HCl.
Origin.
Manganite is present in low-temperature hydrothermal veins where it is usually accompanied by barite and calcite. Together with other manganese minerals, it is found in sedimentary deposits of this metal formed at the bottom of the ancient ocean. Origin. Hydrothermal veins in effusive rocks, in sedimentary deposits together with other manganese oxides (psilomelan, pyrolusite).
Place of Birth.
In Italy, manganite was discovered in Alpe-Aguelo (Como province) in the form of short-prismatic small crystals with characteristic vertical shading. It is also present in the manganese mine of Saint-Marcel (Val d'Aosta region) and in Val Gravela (Liguria region). Good crystals up to 8 cm long came from Ilfeld (Germany).
Manganite. Ilmenau, Thuringia, Germany. Photo: © А.А. Evseev.
Manganite. Lopin (Lohua) deposit, China. Photo: © А.А. Evseev.
ADR 5.1
Substances that are oxidized
Risk of violent reaction, ignition or explosion if exposed to flammable or flammable substances
Do not allow the formation of a mixture of cargo with flammable or combustible substances (eg sawdust)
Yellow diamond, ADR number, black flame above the circle
ADR 4.2
Substances that are capable of self-ignition
Risk of fire due to autoignition in the event that the packaging is damaged or the source of the contents has occurred.
Can react violently with water
White upper half of diamond, red - lower, equal, ADR number, black flame
ADR 4.1
Highly flammable solids , self-reactive substances and solid desensitized explosives
Risk of fire. Flammable or combustible substances can ignite from sparks or flames. May contain self-reactive substances capable of exothermic decomposition in the case of heating, contact with other substances (such as: acids, heavy metal compounds or amines), friction or impact.
This can lead to the emission of harmful or flammable gases or vapor or spontaneous combustion. Containers can explode when heated (over-dangerous - practically do not burn).
Risk of explosion of desensitized explosives after loss of desensitizer
Seven vertical red stripes on a white background, equal in number, ADR number, black flame
ADR 8
Corrosive (corrosive) substances
Risk of burns from skin corrosion. They can react violently with each other (components), with water and other substances. The substance that spilled / crumbled can emit a corrosive vapor.
Dangerous to aquatic environment or sewer system
White upper half of diamond, black - lower, equal, ADR number, test tubes, hands
ADR 9
Other dangerous substances and articles
Risk of burns. Risk of fire. Risk of explosion.
Dangerous to aquatic environment or sewer system
Seven vertical black stripes on white background - top, white - lower half of diamond, ADR number
ADR 4.3
Substances that emit flammable gases in contact with water
Risk of fire and explosion if exposed to water.
The cargo, which crumbled, must be covered and kept dry
Blue and blue diamond, ADR number, black or white flame
The name of a cargo that is particularly dangerous for transportation | room
UN |
Class
ADR |
MARGANZA (II) NITRATE | 2724 | 5.1. |
Manganese (IV) oxide | 1479 | 5.1. |
Manganese ethylene-1,2-bisdithiocarbamate MANEB or MANEBA PREPARATION, which contains not less than 60% maneb | 2210 | 4.2 |
MARGANZA RUBBER | 1330 | 4.1 |
Manganese sulfate, solution | 3082 | 9 |
Manganese phosphate | 3260 | 8 |
Manganese ethylene-1,2-bisdithiocarbamate, stabilized against self-heating MANEB STABILIZED or MANEBA | 2968 | 4.3 |
STABILIZED AGENT against self-heating | 2968 | 4.3 |
MANEB or MANEBA PREPARATION, which contains at least 60% maneb | 2210 | 4.2 |
MANEB STABILIZED OR MANEBA STABILIZED STABILIZED AGAINST HEAT REFRIGERATION | 2968 | 4.3 |
MANITGEXINATRATE (NITROMANITE) HYDROGEN with a mass fraction of water or a mixture of alcohol and water of at least 40% | - | - |
- 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
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