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Tin

The Tin, symbol Sn (from the Latin Stannum ) Is a chemical element atomic number 50 located in Group 14 of the periodic table elements.

is a very abundant metal in Earth's crust. Its principal ore is cassiterite, but can also be obtained from the estannina and cylindrite .

He became a metal exploded in various parts of the Shire of Villuercas Ibores Jara such as in Minas tin (cassiterite) from Cerro de San Cristobal .

ORIGIN

This metal was used in the form of bronze from III of the millennium, but as metal has not been known until the early centuries of our era. During the medieval period was an affordable substitute to make silver tableware and decorative objects.

CHARACTERISTICS OF TIN

is a silvery metal, malleable , not oxidized easily and is resistant to corrosion . Is found in many alloys and used to coat other metals to protect them from corrosion. One of its most striking features is that under certain conditions forms the tin plague. By bending a metal bar that produces a characteristic sound called tin cry , produced by the friction of the crystals that compose it.

ENVIRONMENTAL EFFECTS OF TIN

as simple tin atom or molecule is not very toxic for any type of organism. The toxic form is the organic form. Organotin compounds can remain in the environment for long periods of time. They are very persistent and not readily biodegradable . Microorganisms have many difficulties in breaking organotin compounds that have accumulated in soil water over the years. Organotin concentrations still increase because of this. The

organotins can spread through water systems where particles are absorbed by plants. Are known to cause much damage to aquatic ecosystems because they are very toxic to fungi, algae and phytoplankton . The phytoplankton is a very important link in the aquatic ecosystem, providing oxygen to aquatic organisms. It is also a important part of the aquatic food chain.

There are many different types of organic tin can vary widely in toxicity. Tributyl tins tin compounds are more toxic to fish and fungi, while tin triphenols is much more toxic to phytoplankton .

is known that organotins alter the growth, reproduction, enzyme systems and power schemes of aquatic organisms. The exhibition takes place primarily in upper layer of water, and that's where organotin compounds accumulate.

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El Cerro de San Cristobal, Logrosán

Don Vicente Sos Baynat in its publication, "Geology, Mineralogy and Minerologenia of the Sierra de San Cristobal, Logrosán (Cáceres)" considered that the granite rock formations and the process mineralization that formed the Cerro de San Cristóbal occurred during three different stages. The first during the formation of Hertzian mountains about 250 million years, the second during the Alpine mountain building makes Approximately 50 million years.

Logrosán Granite is classified as two-mica leucogranite and porphyria with compound fenocrsito small amounts of quartz and feldspar, biotite, apatite and rutile, as well as some iron oxide. There are three areas on the north side and one on the west slope of Cerro kaolinized are composed of granite. Granite which comprises the Cerro de San Cristóbal is completely surrounded by shale and sedimentary rocks. The slate is considered Precambrian origin, or of about 700 million years. The granite of Cerro de San Cristobal is surrounded by a well-defined metamorphic aureole composed of clay slate. This halo was formed when the introduction of granite that forms the Hill made contact with the surrounding shale. The nearest granitic region is more than 20 km. Logrosán west and is located just west of the town of Zorita.

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The Phosphorite



The Cassiterite is a mineral that results from oxidation of tin (SnO 2) is a typical mineral pegamtitas , ie is associated with late stage of granite crystallization ( neumatolisis ). In granites and pegmatites neumatolíticos, cassiterite is usually accompanied by wolframite, sheelita and mispíquel .

The cassiterite typically contains 87% tin and 21% of oxygen (plus iron , tantalum and other minerals ) is durísma, heavy and fragile, impervious to acids. Appears in crystals thick, prismatic, often in twin tetragonal system belonging to (with variants ditetragonales and dipiramidales). Less known is often the acicular tin , ie, fine crystals in the form of needle, or in a tin woody , similar to wood. Instead, it is unusual to see him as a loose globular granules ( pleasure tin).

• Hardness between 6 and 7 points on the Mohs Scale Exfoliation
• imperfecta. Specific Gravity
• between 6.8 and 7.1 Kg/dm3
• Color brown almost black (colophony less frequent in yellow, gray or red hyacinth
• System: Tetragonal
• Formula: SnO 2
• Hardness: 7
• Source: pegmatite, hydrothermal and secondary in river or marine pleasure.
• Sites: Germany, Czechoslovakia, France, USSR, Cornwall (Great Britain).
• Applications: As tin ore

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sedimentary rock of organic origin, formed mainly by phosphate minerals. mineral is a compact or earthy color yellowish white, formed by the phosphate of lime. It is used as fertilizer in agriculture after adding sulfuric acid to make it soluble.