|
|
1. (n.) tourmaline
a complex silicate mineral, essentially sodium aluminum borosilicate, occurring in variously colored transparent gem varieties depending on the presence of different metals.
Etymology: (1750–60; earlier tourmalin < G Turmalin, ult. < Sinhalese tōramalliya carnelian; see -in1)
|
| Definition of 'tourmaline' |
Princeton's WordNet |
|
1. (noun) tourmaline
a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
|
| Definition of 'tourmaline' |
Webster Dictionary |
|
1. (noun) tourmaline
a mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels
|
| Definition of 'tourmaline' |
The Standard Electrical Dictionary |
|
1. tourmaline
A mineral; a subsilicate; characterized by the presence of boric trioxide, which replaces aluminum oxide. It is notable for possessing pyro-electric properties. (See Pyro-electricity.)
|
|
|
|
|
| Alternative search options for 'tourmaline' |
|
|
|
|
|
|
|
Definitions of tourmaline 
