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Rubellite is the red or pink variety of tourmaline and is a member of elbaite. Rubellite is also the rarest gem in its family. [2] It is occasionally mistaken for ruby. [3] These gems typically contain inclusions. [4] Notable countries where rubellite can be mined include Afghanistan, Brazil, Madagascar, Myanmar, Nigeria, Russia, and the United ...
Mainly: pyrochlore, tourmaline and amphibole supergroups, arrojadite, and yftisite-(Y). IMA/CNMNC revisions generate hypothetical solid solution endmembers. group – a name used to designate a group of species, sometimes only a mineral group name.
Elbaite, a sodium, lithium, aluminium boro-silicate, with the chemical composition Na(Li 1.5 Al 1.5)Al 6 Si 6 O 18 (BO 3) 3 (OH) 4, [4] is a mineral species belonging to the six-member ring cyclosilicate tourmaline group.
Today this tourmaline locality (type locality for dravite) at Dobrova (near Dravograd), is a part of the Republic of Slovenia. [9] Tschermak gave this tourmaline the name dravite, for the Drava river area, which is the district along the Drava River (in German: Drau, in Latin: Drave) in Austria and Slovenia.
The Schedule of Values must be approved prior to first Payment Application. Schedule of Values can only be changed with approved Budget Transfer process in project accounting software, or by Change Order. After the Schedule of Values is approved, it becomes the basis for all Contractor/Vendor invoices for hard and soft costs." [1]
Inclusions are one of the most important factors when it comes to gem valuation. They diminish the clarity and value of many gemstones, such as diamonds, and increase the value of others, such as star sapphires. [5] Many colored gemstones are expected to have inclusions which do not greatly affect their values. They are categorized into three ...
Investment approach: Value investor and short-seller, buying high-quality companies that are currently undervalued Bill Ackman runs Pershing Square Capital Management, and he’s one of the most ...
Mineral details specifying species of tourmaline etc, and then a seperate section dealing with the gem varieties (that are typically based on color - ignoring the mineral species), rubellite, indicolite, paraiba, bicolor, etc. BTW I would like to confirm whether the statement made by Krementz that "almost all the jewelry-usable material is ...