corundum – מילון אנגלי-אנגלי

מילים נרדפות: mineral

Babylon English

הורד מילון בבילון 9 למחשב שלך

corundum

n. chemical substance which contains aluminum oxide

English Wikipedia - The Free Encyclopedia

הורד מילון בבילון 9 למחשב שלך

Corundum

Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen.

See more at Wikipedia.org...

WordNet 2.0

הורד מילון בבילון 9 למחשב שלך

corundum

Noun
1. very hard mineral used as an abrasive
(synonym) corundom
(hypernym) mineral
(hyponym) alumina, aluminum oxide, aluminium oxide
(substance-holonym) emery

Webster's Revised Unabridged Dictionary (1913)

הורד מילון בבילון 9 למחשב שלך

Corundum

(n.)
The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About

Mineralogy Database

הורד מילון בבילון 9 למחשב שלך

Corundum

General Information:

Chemical Formula:
Al2O3

Composition:
(Molecular Weight = 101.96 gm)
Aluminum 52.93 % Al
Oxygen 47.07 % O

Empirical Formula:
(Al2O3)

Environment:
Contact and regionally metamorphosed rocks.

Locality:
Tchainit and Yakutia, Russia.

Name Origin:
Probably derived from the Sanskrit, kuruvinda, meaning "ruby."
Physical Properties:

Cleavage:
None

Color:
blue, red, yellow, brown, or gray.

Density:
4 - 4.1, Average = 4.05

Diaphaniety:
Transparent to translucent

Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms ( e.g. tourmaline).

Hardness:
9 - Corundum

Luminescence:
None.

Luster:
Vitreous (Glassy)

Streak:
none
More details...

corundum – מילון אנגלי-עברי

corundum – מילון אנגלי-אנגלי