Much haematite occurs in a compact or massive form, often mammillary, and presenting on fracture a fibrous structure.
The hardness of the crystallized haematite is about 6, and the specific gravity 5.
The hardhaematite is occasionally cut and polished as an ornamental stone, and certain kinds have been made into beads simulating black pearls.
Specular haematite forms a constituent of certain schistose rocks, such as the Brazilian itabirite.
Santiago de Compostela in Spain furnishes a considerable supply ofhaematite burnishers.
Haematite crystallizes in the rhombohedral system, and is isomorphous with corundum (Al2O3).
Ferric oxide or iron sesquioxide, Fe2O3, constitutes the valuable ores red haematite and specular iron; the minerals brownhaematite or limonite, and gothite and also iron rust are hydrated forms.
The elevated plains among these mountain masses show great patches of ferruginous conglomerate, which, when broken, look like yellow haematite with madrepore holes in it: this has made the soil of a red colour.
Some fragments of titaniferous iron ore, with haematite changed by heat, and magnetic, lay in the gully, which had worn itself a channel on the north side of the village.
Yellow haematite is very abundant, but the other rocks scarcely appear in the distance; we have mountains both on the east and west.
We went over flat forest with patches of brown haematite cropping out; this is the usual iron ore, but I saw in a village pieces of specular iron-ore which had been brought for smelting.
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 withhaematite facing, highly burnished.
A hard compact variety of haematiteused to form burnishers.
In this, the filtering material is said to be prepared by heating haematite with sawdust.
It is obtained fromhaematite and spathic ore, coke being used for the smelting.
According to the memoir of the geological survey, there are traces of ancient surface iron-workings in the Middle Lias formation of Oxfordshire, where red and brown haematite were found.
Haematite is found in large quantities in West Cumberland and north Lancashire and in south-western England, while the chief source of jet is Whitby in Yorkshire, where it occurs in large quantities in beds of the Upper Lias shale.
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 Barrow Haematite Steel Company (1866) absorbed this company, and a great output of steel produced by the Bessemer process was begun.
Its rise was dependent primarily on the existence and working of the veins of pure haematite iron ore in the district of Furness (q.
In many cases it has been formed from other iron oxides, like haematite and magnetite, or by the alteration of pyrites or chalybite.
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 probably represents the partial dehydration of limonite, and by further loss of water may pass into haematite or red iron ore.
On the other hand there are certain forms of ferric hydrate containing less water than limonite and approaching to haematite in their red colour and streak: such is the mineral which was called hydrohaematite by A.
They are often impure, and their iron may be present as haematite or as chalybite.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "haematite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
