The Breo Roam sports watch is made from a material known as tourmaline, a naturally occurring mineral widely used as a semi-precious gemstone. From Wordnik.com. [TREND HUNTER - The Latest Trends] Reference
Brown tourmaline is sometimes very pleasing in color. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Mr. Ruiz asked: "Where is the rock with the tourmaline?". From Wordnik.com. [Hunters Comb Globe for a Hot Metal] Reference
Gem tourmaline comes from Ceylon, from Madagascar, from the. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The marked dichroism of tourmaline will also help detect it. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The dichroism is feeble too, whereas that of tourmaline is strong. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
(A student of Aristotle noticed this when studying the gemstone tourmaline.). From Wordnik.com. [Tapping the Force of Fusion, Again] Reference
California especially, is not excelled by tourmaline from any other locality. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Pink topaz, however, is very rare, and until recently, when pink tourmaline from. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
These double images might have been produced by tourmaline as well as by emerald. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The dichroism of tourmaline is stronger than that of ruby and more obvious to the unaided eye. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The ancients also described what was probably tourmaline, a mineral which has the same qualities. From Wordnik.com. [Electricity for Boys] Reference
We refer to the pink crystals of tourmaline, whose colour comes from a small admixture of lithium. From Wordnik.com. [Man or Matter] Reference
I highly recommend the Green Marine: it is the tourmaline green I have been looking for all my life. From Wordnik.com. [if they take us, they will burn us.] Reference
A piece of tourmaline of any size weighs three times as much as an equal volume of pure water at 4°. From Wordnik.com. [Scientific American Supplement, No. 1082, September 26, 1896] Reference
Suddenly the tourmaline chip of a dianthus, or the seed pearl of the thumb-sized sedum, is very appealing. From Wordnik.com. [Back to the Garden] Reference
Some of the Maine tourmaline is of a delightful, slightly bluish-green tint that almost approaches emerald. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
She stared at the tourmaline pieces scattered across the game board in a pattern she could not yet understand. From Wordnik.com. [Lord of the Isles] Reference
Connecticut green tourmaline tends more to the dark yellowish green, and Ceylon tourmaline to the olive green. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Other crystals are curved, and some perforated in the axis like the tourmaline, so as to contain other minerals. From Wordnik.com. [Lippincott's Magazine of Popular Literature and Science Volume 11, No. 27, June, 1873] Reference
The presence of the dark gray or black mineral tourmaline in a rock is often a sure sign that there is copper nearby. From Wordnik.com. [Hunters Comb Globe for a Hot Metal] Reference
The tourmaline has a light-refractive index of 1.63, with a heat index of none, being to heat-rays completely opaque. From Wordnik.com. [The Chemistry, Properties and Tests of Precious Stones] Reference
A very fine Maine tourmaline might approach this stone in color, so it became necessary to consider this possibility. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The luster of olivine (whether of the peridot shade or not) is oily, and this may serve to distinguish it from tourmaline. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The test is most useful for emerald, ruby, sapphire, tourmaline, kunzite and alexandrite, all of which show marked dichroism. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
If exposed to a flame, however, it endows it with a definite colour which is the same as that of the lithium-coloured tourmaline. From Wordnik.com. [Man or Matter] Reference
They consisted mainly of minute jagged cracks of the character peculiar to brittle materials such as both emerald and tourmaline. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Some of the Madagascar tourmaline is of a fine brownish red, almost as deep as a light garnet, and much clearer than most garnet. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
This night between dusk and dawning a spike of blue tourmaline had appeared on the board in conjunction with the four pieces of power. From Wordnik.com. [Lord of the Isles] Reference
The sharp jagged flaws and cracks that so often appear in emerald are likely to appear also in tourmaline as both are brittle materials. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Electric and magnetic influences, 57 experiments with precious stones and pithball and electroscope, 57 experiments with tourmaline, 58, 59. From Wordnik.com. [The Chemistry, Properties and Tests of Precious Stones] Reference
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