Tourmaline gem stone rough in fine quality facet grade is
still another of the highly desirable gems found in Madagascar. We are proud to
offer fine tourmaline rough to you.
Tourmaline
gem stone rough in flawless and near-flawless crystals are being
mined in Madagascar today, and new deposits are being located.
Madagascar tourmaline is generally available
in blue, green, peach, pink, and red... and occasionally in other colors
and bi-colors.
You can now buy Madagascar gem rough
in quantity directly from a strong source in Madagascar... from our USA
office.
You can avoid the export and import problems and fees.
Until Madagascar Gems began selling
high-grade rough gem stones on the internet, the only way to get good
Madagascar tourmaline was to go there.
The name tourmaline comes from the Singhalese
word “turmali” that means “mixed.” Tourmaline occurs in
over 100 hues, resulting in a tendency for it to be confused and then
mixed with other gem varieties.
Tourmalines of the liddicoatite-elbaite
seriesfrom Madagascar's rare-element pegmatites are the
subject of both the gem industry and scientific interests.
Tourmaline possesses a special
property, known as piezoelectricity, Heating or rubbing this gem causes it
to build an electrical charge and to become slightly magnetic.
Tourmaline is now used in products such
as computers, musical keyboards, cellular phones and other hi-tech
electronic devices.
Tourmaline gem stone rough prices are based on
size of the pieces, and the quantity purchased per
order.
Tourmaline prices...
Size
10 grams
50 grams
100
grams
0.5 to 1
g
$240
$1000
$1800
Larger sizes are less occurring.
Inquire by email for availability and price. Exceptional stones are
occasionally posted on this page.
Tourmaline properties:
Hardness: 7-7.5
Refractive index:
1.616-1.652
Critical angle:
38°
Specific gravity:
2.9-3.26
Cleavage: None
Fracture: Uneven,
small conchoidal.
Dispersion:
Medium (.017)
Heat sensitivity:
Moderate
Pleochroism:
Dichroic. Strong (many color variations).
Birefringence
(double refraction): Medium (.014-.024)
