Hematite

(1) An iron mineral crystallizing in therhombohedral system; the most important are of iron. (2) An iron oxide, Fe,O,, corresponding to an iron content of approximately 70%.

hematite

Astronomy; Planetary science

An iron-oxide mineral (Fe 2 O 3 ) that may be the cause of the red color on Mars. Courser-grained gray hematite has the same chemical formula as the red variety, but a different ...

hematite

Earth science; Soil science

Fe2O3. A red iron oxide mineral that contributes red color to many soils.

hematite

Oil & gas; Drilling

The mineral form of ferric oxide (Fe 2 O 3 ). The hematite ore used as a weighting material in drilling muds has a mica-like crystal structure that grinds to particle size ...

Gauls

Anthropology; Cultural anthropology

The Gauls were a Celtic people living in Gaul, the region roughly corresponding to what is now France, Belgium, Switzerland and Northern Italy, from the Iron Age through to the ...

Picts

Anthropology; Cultural anthropology

The Picts were a group of Late Iron Age and Early Mediaeval Celtic people living in ancient eastern and northern Scotland. They are recorded from before the Roman conquest of ...

Celts

Anthropology; Cultural anthropology

The Celts were an Indo-European and etho-linguistically diverse group of tribal societies in Iron Age and Roman-era Europe who spoke Celtic languages. By the first millennium AD ...

Cherokee

Anthropology; Cultural anthropology

The Cherokee are a Native American people historically settled in the Southeastern United States (principally Georgia, North and South Carolina and East Tennessee). Historians and ...

Iceni

Anthropology; Cultural anthropology

The Iceni (or Eceni) were a British tribe who inhabited an read of East Anglia corresponding roughly to present day Norfolk between the 1st century BC and the 1st century AD. The ...

pecking and grinding

Anthropology; Cultural anthropology

The process of manufacturing heavy-duty stone tools (bowls, mauls etc. ) From granular rocks by prolonged hammering with a hammerstone. Abrasive techniques might be used to finish ...

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Industry/Domain: Sports Category: Fishing

Improved clinch knot

A simple yet very strong knot for tying hooks and lures to fishing line that is most often used by anglers. Being quick and easy to tie are the main ...