tourmaline 音標拼音: [t'ʊrməl
, in]
n . 電石
電石
tourmaline n 1 :
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 Tourmaline \
Tour "
ma *
line \,
n . [
F .
tourmaline ,
cf .
It .
turmalina ,
tormalina ,
NL .
turmalina ,
turmalinus ;
all fr .
tournamal ,
a name given to this stone in Ceylon .] (
Min .)
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 . [
Written also {
turmaline } .]
[
1913 Webster ]
Note :
Crystals of tourmaline when heated exhibit electric polarity (
see {
Pyroelectric },
n .).
Tourmaline is also used in the form of a polariscope called tourmaline tongs .
[
1913 Webster ]
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