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Tanzanite

Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate). The color is caused by small amounts of vanadium. Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a very small mining area approximately 7 km (4.3 mi) long and 2 km…

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Key facts & relationships

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Birefringence
0.006–0.018
Category
Sorosilicate: zoisite variety
Cleavage
Perfect {010}, imperfect {100}
Color
Royal blue, indigo, violet/purple
Crystal habit
Prismatic crystals with striations; massive to columnar
Crystal system
Orthorhombic

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Overview

Geology

History

Factors affecting value: grading

Imitation and cobalt-coated tanzanite

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Map overview Semantic statistics

Tanzanite

Nodes81
Edges80
Triples97
Avg. degree1.98
Density0.024691
Components1

How this topic connects Entity context

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Tanzanite

Top relations

related to history · 34
Tanzanite → America, Arusha, British Museum, Co, Correct, Dodoma, Gemological Institute, Goan, Harvard University, He, Heidelberg University, Henry, Hyman Saul, Ian McCloud, In July, John Saul, Kenya, Louis Comfort Tiffany, Manuel, Mererani
related to Discovery · 17
Tanzanite → Arusha Region, He, In, In January, Jumanne Mhero Ngoma, Kilimanjaro, Kiteto District, Manyara Region, Mererani, President Julius Nyerere, Same District, Science, Tanzania, Tanzania Commission, Technology, There, Tsh
related to Factors affecting value: grading · 8
Tanzanite → After, As, March, Tanzanite Foundation, TanzaniteOne, The, There, Untreated
related to Imitation and cobalt-coated tanzanite · 7
Tanzanite → Among, As, However, It, Mg2SiO4, Synthetic, The
has treatment · 5
Tanzanite → Heat-treating, Heating, Rarely, The, These
related to Geology · 4
Tanzanite → Deposits, Ediacaran, Mount Kilimanjaro, The
is a · 2
Tanzanite → blue and violet variety of the mineral zoisite, trichroic gemstone
related to Pleochroism in tanzanite · 2
Tanzanite → Most, The
Birefringence · 1
Tanzanite → 0.006–0.018
Category · 1
Tanzanite → Sorosilicate: zoisite variety

Important terminology Word statistics

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Important terminology

blue violet tanzania heat zoisite stones treatment stone mineral mining gemstone crystal found appear color government tanzanian area light gem

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
TanzaniteBirefringence0.006–0.0181.00infobox
TanzaniteCategorySorosilicate: zoisite variety1.00infobox
TanzaniteCleavagePerfect {010}, imperfect {100}1.00infobox
TanzaniteColorRoyal blue, indigo, violet/purple1.00infobox
TanzaniteCrystal habitPrismatic crystals with striations; massive to columnar1.00infobox
TanzaniteCrystal systemOrthorhombic1.00infobox
TanzaniteFormula.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l…1.00infobox
TanzaniteFractureUneven to conchoidal1.00infobox
TanzaniteLusterVitreous, pearly on cleavage surfaces1.00infobox
TanzaniteMohs scale hardness6.51.00infobox
TanzaniteOptical propertiesbiaxial positive1.00infobox
TanzanitePleochroismPresent, dichroism or trichroism, depending on heat treatment1.00infobox
TanzaniteRefractive index1.69–1.701.00infobox
TanzaniteSpace groupPnma (no. 62)1.00infobox
TanzaniteSpecific gravity3.10–3.381.00infobox
TanzaniteStreakWhite or colorless1.00infobox
TanzaniteStrunz classification09.BG.101.00infobox
TanzaniteTwinningpenetration twins1.00infobox
Tanzaniteis ablue and violet variety of the mineral zoisite0.90text
Tanzaniteis atrichroic gemstone0.90text

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