Ferric thiocyanate has been suggested, and sulfur was said to have been detected in the mineral.

The mineral was first discovered in Saxony by August Breithaupt in 1817, and named by him from the Greek amblus, blunt, and gouia, angle, because of the obtuse angle between the cleavages.

Later it was found at Montebras, Creuse, France, and at Hebron in Maine ; and because of slight differences in optical character and chemical composition the names montebrasite and hebronite have been applied to the mineral from these localities.

Its hydroxide was known in pre-modern history as baryta ; this substance does not occur as a mineral, but can be prepared by heating barium carbonate.

An argument that the power to issue shares could only be properly exercised to raise new capital was rejected as too narrow, and it was held that it would be a proper exercise of the director's powers to issue shares to a larger company to ensure the financial stability of the company, or as part of an agreement to exploit mineral rights owned by the company.

In 2005, Clipperton's ecosystem was extensively studied for four months by a scientific mission organized by Jean-Louis Étienne, which made a complete inventory of mineral, plant, and animal species found on the atoll, studied algae as deep as 100 m ( 330 ft ) below sea level, and examined the effects of pollution on the island.

It later came to the attention of the West when it was discovered by Louis Nicolas Vauquelin in the mineral crocoite ( lead ( II ) chromate ) in 1797.

Crocoite was used as a pigment, and after the discovery that the mineral chromite also contains chromium, this mineral was used to produce pigments as well.

Other experimenters tried a variety of other substances, of which the most widely used was the mineral galena ( lead sulfide ).

" Sodomite salt " was an essential mineral for the temple's holy incense, but was said to be dangerous for home use and could cause blindness.

The unsuccessful " Wonga Coup " was attempted by European and South African mercenaries in 2004 with the goal of replacing Obiang with a puppet ruler who would open the country's mineral wealth to the plotters.

G. Evelyn Hutchinson, a pioneering limnologist who was a contemporary of Tansley's, combined Charles Elton's ideas about trophic ecology with those of Russian geochemist Vladimir Vernadsky to suggest that mineral nutrient availability in a lake limited algal production which would, in turn, limit the abundance of animals that feed on algae.

The name was derived from the mineral fluorite ( calcium difluoride ), some examples of which contain traces of divalent europium, which serves as the fluorescent activator to emit blue light.

Ivigtut was formerly the world's premier source of natural cryolite, an important mineral in aluminum extraction, but the commercially viable reserves were depleted in the 1980s.

The latter mineral proved to contain far more of the element with the new spectral line, and Galissard de Marignac eventually separated a mineral oxide from cerite which he realized was the oxide of this new element.

However, the composition and origin of the magma which differentiates into granite, leaves certain geochemical and mineral evidence as to what the granite's parental rock was.

Essexites represent gabbros whose parent magma was under-saturated with silica, resulting in the formation of the feldspathoid mineral nepheline.

Helium was also isolated by the American geochemist William Francis Hillebrand prior to Ramsay's discovery when he noticed unusual spectral lines while testing a sample of the mineral uraninite.

As of 2012 there was extensive exploration for commercially viable copper and gold deposits in the mineral belt in northern Haiti but on operations had begun on the numerous and extensive promising propects.

Later the doctor used mineral oil on the burns.

If used for drinking, mineral supplements or mineralization is necessary.

Löwig used a solution of the mineral salt saturated with chlorine and extracted the bromine with diethyl ether.

Chemical reactions are central to chemical engineering where they are used for the synthesis of new compounds from natural raw materials such as petroleum and mineral ores.

poaching threatens wildlife populations ( for example, the Painted Hunting Dog, Lycaon pictus is now considered extinct in the Congo due to human overpopulation and poaching ); water pollution ; deforestation ( chiefly due to land conversion to agriculture by indigenous farmers ); refugees responsible for significant deforestation, soil erosion, and wildlife poaching ; mining of minerals ( coltan — a mineral used in creating capacitors, diamonds, and gold ) causing environmental damage

This process can yield large amounts of metallic sodium and gaseous chlorine, and is widely used on mineral dressing and metallurgy industries.

The nation's other recently announced treasure is the Hajigak iron ore mine, located 130 miles west of Kabul and is believed to hold an estimated 1. 8 billion to 2 billion metric tons of the mineral used to make steel.

* Firewalls can be used to separate high value transformers at an electrical substation in the event of a mineral oil tank rupture and ignition.

A gemstone or gem ( also called a precious or semi-precious stone, a fine gem, or jewel ) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments.

Rock wool ( mineral wool ) is the most widely used medium in hydroponics.

Pink cubic halite ( NaCl ; halide class ) crystals on a nahcolite matrix ( NaHCO < sub > 3 </ sub >; a carbonate, and mineral form of sodium bicarbonate, used as baking soda ).

Sub-surface mining can be classified by the type of access shafts used, the extraction method or the technique used to reach the mineral deposit.

In the 19th century, the term " petroleum " was frequently used to refer to mineral oils produced by distillation from mined organic solids such as cannel coal ( and later oil shale ), and refined oils produced from them ; in the United Kingdom, storage ( and later transport ) of these oils were regulated by a series of Petroleum Acts, from the Petroleum Act 1862 c. 66 onward.

Uranium-lead dating is often performed on the mineral zircon ( ZrSiO < sub > 4 </ sub >), though it can be used on other materials, such as baddeleyite.

The years just after independence were prosperous with money from mineral resources being used for development and the founding of Njala University.

While these humans eventually rebelled and buried the Stargate, thousands of others had been taken to the other planet through the Stargate and used to mine the quartzite-like mineral on which all of Ra's technology is based.

After the 18th century the word ruby was only used for the red gem variety of the mineral corundum and the word spinel became used.

The other name " wolfram " ( or " volfram "), used for example in most European ( especially Germanic and Slavic ) languages, is derived from the mineral wolframite, and this is also the origin of its chemical symbol, W. The name " wolframite " is derived from German " wolf rahm " (" wolf soot " or " wolf cream "), the name given to tungsten by Johan Gottschalk Wallerius in 1747.

The chemical abbreviation for sodium was first published by Jöns Jakob Berzelius in his system of atomic symbols, and is a contraction of the element's new Latin name natrium, which refers to the Egyptian natron, a natural mineral salt primarily made of hydrated sodium carbonate.

At first, Smith remained vague on the reasons for the spread of Egyptian influence to places without mineral deposits like Polynesia.

The Egyptian historian Al-Idrisi ( d. 1251 ) developed another archaeological methodology in his book Anwar for Egyptology, which included: " reasons for the study of the importance of the pyramids ; description of the route to the site ; description of the pyramids and their inscriptions ; measuring, and checking previous measurements ; analysis of the form of the pyramid and reasons for building, with a critical review of literature ( more than 22 authorities quoted ) on the subject ; study of sediments as an indication of the flood level ; chemical analysis of clay in building material, by studying its mineral content in order to check place of origin ; regular visits to the site to see it in different conditions, and to recheck measurements ; noting stones reused at Jeremias Monastery, Saqqara as evidence of earlier dates, an observation confirmed by modern research.

The word pit ' dah is thought by scholars to be connected with the Assyrian word hipindu, which refers to something that flashed ( presumably meaning shimmered ), and thus the jewel in question would fit the description of Chrysolite, a translucent greenish yellow mineral, common throughout the Levant, and particularly found on a particular island in the Red Sea, under the control of the Egyptian Pharaoh.

Nofekh appears to be a loan word ; it may derive from the Egyptian term m-f-k-t, referring to Malachite or Turquoise, both of which are a greenish blue ; it may instead derive from lupakku, a term appearing in the Amarna letters, referring to a mineral of unknown colour which was sent in tribute to Akhnaten from Ashkalon.