How to use Haematite in a sentence
It is found also in beds of iron ore, and the haematite mines of the Cleator Moor district in west Cumberland have yielded many extremely fine crystals, specimens of which may be seen in all mineral collections.
The quality of ore in the two ranges differs somewhat, that mined from the Vermilion Range being a hard specular or red haematite, while that taken from the Mesabi Range, largely red haematite, is much softer and in many localities quite finely comminuted.
Carnforth Haematite Iron Company had four blast furnaces at work in 1870.
Goethite, limonite and haematite are found in New South Wales, at the junction of the Hawkesbury sandstone formation and the Wianamatta shale, near Nattai, and are enhanced in their value by their proximity to coal-beds.
The deposits are superficial, resulting from the opening out of veins at the surface, and consist chiefly of haematite.Advertisement
Iron - haematite - is present almost everywhere.
By deoxidation, haematite may be converted into magnetite, as proved by certain pseudomorphs; but on the other hand magnetite is sometimes altered to haematite.
To tin cast-iron articles they must be decarburetted superficially by ignition within a bath of ferric oxide (powdered haematite or similar material), then cleaned with acid, and tinned by immersion, as explained above.
In the neighbourhood of Millom there are blast furnaces and highly productive mines of red haematite ore.
The green colour is due to a chloritic mineral; the red to haematite.Advertisement
Iron ore (haematite) is abundant.
The brownish colour of some slates is due to limonite and haematite, but magnetite occurs in the darker coloured varieties.
The kat is not unusual in Syria (44), and among the haematite weights of Troy (44) are nine examples, average 144, but not of extreme varieties.
In Syria haematite weights are found (30) averaging 198.5, divided into 99.2, 49.6 and 24.8; and the same division is shown by gold rings from Egypt (38) of 24.9.
Probably before any Greek coinage we find this among the haematite weights of Troy (44), ranging from 208 to 193.2 (or 104-96.6), i.e.Advertisement
I.ocally the Archean contains iron ore, as in the Vermilion district of northern Minnesota, and at some points in Ontario.- The ore is mostly in the form of haematite.
The ore is chiefly haematite, and has been developeci from antecedent ferruginous sedimentary deposits, through concentration and purification by ground water.
But in the recent and great development of the iron industry the red haematite ores have been overwhelmingly predominant.
From 1889 to 1907 the average yearly percentages of the red haematite, brown ores, rnagnetite and carbonate in the total ore production were respectively 824, I0I, 7.1 and 0.4.
With the reservations that only in the case of certain red haematite bedded deposits can any estimate be made of relative accuracy, say within 10%; that the concentration deposits of brown ore can be estimated only with an accuracy represented by a factor varying between 0.7 and 3; and that the great Lake Superior and the less known Adirondack deposits can be estimated within 15 to 20%, the total supply of the country was estimated at 79,594,220,000 long tons73,21o,415,000 of which were credited to haematite ores and 5,054,675,000 to magnetite.Advertisement
The iron ore (found chiefly in the region of which Birmingham is the centre) is primarily red haematite and (much less important) brown haematite; though as regards the latter Alabama ranked first among the states of the Union in 1905 (with 781,561 tons).
It is never crystallized, but may have a fibrous or microcrystalline structure, and commonly occurs in concretionary forms or in compact and earthy masses; sometimes mammillated, botryoidal, reniform or stalactitic. The colour presents various shades of brown and yellow, and the streak is always brownish, a character which distinguishes it from haematite with a red, or from magnetite with a black streak.
It is sometimes called brown haematite.
In many cases it has been formed from other iron oxides, like haematite and magnetite, or by the alteration of pyrites or chalybite.
It probably represents the partial dehydration of limonite, and by further loss of water may pass into haematite or red iron ore.Advertisement
Within the Carboniferous rocks, but due to the action of various agencies long after their deposition, are important ore formations; such are the Rio Tinto ores of Spain, the lead and zinc ores and some haematite of the Pennine and Mendip hills and other British localities, and many ore regions in the United States.
They are four important iron ores, magnetite, haematite, limonite and siderite, and one of less but still considerable importance, pyrite or pyrites.
Haematite, or red haematite, Fe 2 0 3, contains 70% of iron.
Limonite and the related minerals, turgite, 2Fe20 3 +H 2 O, and gothite, Fe 2 0 3 +H20, are grouped together under the term " brown haematite."
In some cases the iron-bearing mineral, such as magnetite or haematite, can be separated from the gangue after crushing, either mechanically or magnetically, so that the part thus enriched or " concentrated " alone need be smelted.
The rich beds near Lake Superior, chiefly red haematite, yielding at present about 55% of iron, are thought to contain between II and 2 billion tons, and the red and brown haematites of the southern states about to billion tons.
Under all these three conditions the diamond is associated with fragments of the rocks of the country and the minerals derived from them, 'especially quartz, hornstone, jasper, the polymorphous oxide of titanium (rutile, anatase and brookite), oxides and hydrates of iron (magnetite, ilmenite, haematite, limonite), oxide of tin, iron pyrites, tourmaline, garnet, xenotime, monazite, kyanite, diaspore, sphene, topaz, and several phosphates, and also gold.
At Sao Joao da Chapada, in Minas Geraes, diamonds occur in a clay interstratified with the itacolumite, and are accompanied by sharp crystals of rutile and haematite in the neighbourhood of decomposed quartz veins which intersect the itacolumite.
Considerable veins of haematite of good quality occur both in the Red Sea hills and in Sinai.
In the earlier part of the prehistoric age there was a soft brown ware with haematite facing, highly burnished.
This was burnt mouth-down in the oven., and the ashes on the ground reduced the red haematite to black magnetic oxide of iron; some traces of carbonyl in the ash helped to rearrange the magnetite as a brilliant mirror-like surface of intense black.
Red ochre, for which there is only a limited market, is mined on Ormuz, Abu Musa and other islands in the Gulf; salt, as deposits, on Ormuz and Qishm I., and by evaporation, near Mohammerah, Fao and elsewhere on both sides of the Gulf; gypsum is widely distributed throughout the Gulf; iron, as haematite and pyrites, widely found through the Ormuz series.
The ore is partly a clay ironstone, like that occurring in the Coalmeasures of England, partly an oxide of iron or haematite, and it generally contains phosphorus.
The ore is a red haematite occurring in slate.
When crystallized, however, haematite often presents a dark colour, even iron-black; but on scratching the surface, the powder of the streak shows the colour of dried blood.
Haematite crystallizes in the rhombohedral system, and is isomorphous with corundum (Al203).
Haematite has no distinct cleavage, but may show, in consequence of a lamellar structure, a tendency to parting along certain planes.
Crystallized haematite, such as that from the iron-mines of Elba, presents a steel-grey or ironblack colour, with a brilliant metallic lustre, sometimes beautifully iridescent.
The hardness of the crystallized haematite is about 6, and the specific gravity 5.2.
Micaceous iron ore consists of delicate steel-grey scales of specular haematite, unctuous to the touch, used as a lubricant and also as a pigment.
Very thin laminae of haematite, blood-red by transmitted light, occur as microscopic enclosures in certain minerals, such as carnallite and sun-stone, to which they impart colour and lustre.
Much haematite occurs in a compact or massive form, often mammillary, and presenting on fracture a fibrous structure.
The hard haematite is occasionally cut and polished as an ornamental stone, and certain kinds have been made into beads simulating black pearls.
Haematite is an important ore of iron (q.v.), and is extensively worked in Elba, Spain (Bilbao), Scandinavia, the Lake Superior region and elsewhere.
Iron is widely diffused, principally in the form of magnetite, brown haematite, limonite and bog iron.
The richness of the ore (about 30% of metal) is by no means so great as the red haematite ore found in Cumberland and north Lancashire (Furness district, &c.).
Enclosures of other minerals (rutile, chlorite, haematite, gothite, actinolite, asbestos and many others) are extremely frequent in crystals of quartz.
Red haematite was mined in Dodge county before 1854; in 1877 the deposits in Florence (disambiguation)|Florence county were first worked, and in 1882 276,017 tons were shipped from that county; and about 1884 began the development of the Gogebic deposits in Iron and Ashland counties.
The output is almost entirely haematite.
Ferric oxide or iron sesquioxide, Fe203, constitutes the valuable ores red haematite and specular iron; the minerals brown haematite or limonite, and gothite and also iron rust are hydrated forms. It is obtained as a steel-grey crystalline powder by igniting the oxide or any ferric salt containing a volatile acid.
His results prompted Bessemer to try the purer iron obtained from Cumberland haematite, but even with this he did not meet with much success, until Robert Mushet showed that the addition of a certain quantity of spiegeleisen had the effect of removing the difficulties.
A white horse may have the spots removed with the Spanish haematite or with aqua fortis or with.. .
Other black specks have been identified as haematite and ilmenite; gold has also been found; other included minerals recorded are rutile, topaz, quartz, pyrites, apophyllite, and green scales of chlorite (?).
The essential coloring materials are, for blue, copper; green, copper and iron; purple, cobalt; red, haematite; white, tin.