Tinzenite

Tinzenite is named after its discovery locality, at Tinzen, Grischun, Switzerland.

Tinzenite forms transparent to translucent yellow, brownish yellow-green, orange, red prismatic crystals to 5 mm or masses with vitreous lustre.

Tinzenite makes attractive faceted stones that can be used in the jewellery.
General Information
Chemical Formula
(Ca,Mn
2+
 
,Fe
2+
 
)
 
3
Al
 
2
BSi
 
4
O
 
15
(OH)
Anthony et al, Handbook of mineralogy (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Tinzenite
Mohs Hardness6.5 to 0
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity3.355 to 3.433
Anthony et al, Handbook of mineralogy (2001)
TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityGood,Poor
Anthony et al, Handbook of mineralogy (2001)
FractureUneven,Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Tinzenite
Refractive Index1.690 to 1.705
Anthony et al, Handbook of mineralogy (2001)
Optical CharacterBiaxial/-
Anthony et al, Handbook of mineralogy (2001)
PleochroismIn thick sections, weak: light brown - violet - light yellow or colorless
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Yellow, brownish yellow-green; orange to red in thin section.
Anthony et al, Handbook of mineralogy (2001)
TransparencyTransparent,Translucent
Anthony et al, Handbook of mineralogy (2001)
LustreVitreous
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Tinzenite
Crystal SystemTriclinic
Anthony et al, Handbook of mineralogy (2001)
HabitAs aggregates of prismatic crystals, to 5 mm; massive.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:In metamorphosed manganese-bearing ophiolites (Liguria, Italy); in quartz veins in cherts of the greenschist facies (Akatore, New Zealand).
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Tinzenite information at mindat.org
Significant Gem Localities
Italy
 
  • Liguria
    • Genoa
      • Ne
        • Reppia
          • Monte Copello
New Zealand
 
  • Otago Region
    • Clutha District
Switzerland
 
  • Grisons
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
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