THE GEMSTONE TOURMALINE



Tourmaline is the most colorful of all gemstones. It occurs in all colors, but pink, red, green, blue and multicolored are its most well-known gem colors. Scientifically, tourmaline is not a single mineral, but a group of minerals related in their physical and chemical properties. The mineral Elbaite is the member of the Tourmaline group that is responsible for almost all the gem varieties. Three other members of the group - Schorl, Dravite and Liddicoatite, are seldom used as gemstones.




Agate

Alexandrite

Almandine

Amazonite

Amber

Amethyst

Ametrine

Andalusite

Andesine

Andradite

Aquamarine

Aventurine

Benitoite

Beryl

Bloodstone

Carnelian

Cat's Eye

Chalcedony

Chrysoberyl

Chrysocolla

Chrysoprase

Citrine

Copper

Coral

Danburite

Diamond

Diaspore

Diopside

Dumortierite

Emerald

Fluorite

Garnet

Gold

Golden Beryl

Goshenite

Grossular

Hiddenite

Iolite

Jade

Jasper

Kunzite

Kyanite

Labradorite

Lapis Lazuli

Larimar



Tanzania Collected Three Years' Worth of Tanzanite Royalties in Three Months

  1. Dodoma -- The government said on Thursday that it has collected Sh614.67 million as royalty from tanzanite artisanal miners in three months, from January to March this year. This is more than what …
  2. {read by 214 people}


Tanzania: Tanzanite Bows to Govt Pressure

  1. TANZANITE One Mining Company has agreed to compensate and pay all taxes it owes the government, conceding some malpractices in its operations in the country. Chairman of President John Magufuli for…
  2. {read by 203 people}


Mining ministry plans support for artisanal gold miners

  1. The Ministry of Mining has dispelled claims it has shut down gold mining activities in Migori. The ministry however says there is need to empower gold miners with technical capacity and machinery t…
  2. {read by 225 people}


Artisanal gold miners in Nigeria seek government help

  1. Artisanal gold miners in the Niger state of Nigeria are asking the Muhammadu Buhari government to help them operate under conditions that allow them to take better care of the environment and contribu…
  2. {read by 306 people}


EDITORIAL: Improve miners' welfare

  1. Reports that a gold mining firm has applied for a licence to extract the precious metal from the leftovers of small-scale miners in Migori is a clear sign that the local residents have been left to th…
  2. {read by 317 people}


Need to improve miners safety and health standards

  1. ARTISANAL and small-scale gold mining (ASGM) is undoubtedly a growing sector that contributes significantly to the growth of the country’s economy. Although, there are no official statistics, estimat…
  2. {read by 337 people}



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