Humite

Humite was named after Sir Abraham Hume, English connoisseur and collector artwork, precious stones and minerals. It was found in the volcanically ejected masses of Mt Vesuvius.

Transparent to translucent, yellow and intense orange crystals of gem-quality Humite are very small and are rarely faceted.
General Information
Chemical Formula
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
Anthony et al, Handbook of mineralogy (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Humite
Mohs Hardness6 to 0
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity3.20 to 3.32
Anthony et al, Handbook of mineralogy (2001)
TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityPoor
Anthony et al, Handbook of mineralogy (2001)
FractureUneven,Sub-Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Humite
Refractive Index1.607 to 1.675
Anthony et al, Handbook of mineralogy (2001)
Optical CharacterBiaxial/+
Anthony et al, Handbook of mineralogy (2001)
PleochroismVery pale yellow to dark yellow - colorless, pale yellow.
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)White, yellow, dark orange, brown; colorless to yellow-brown 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 Humite
Crystal SystemOrthorhombic
Anthony et al, Handbook of mineralogy (2001)
HabitCrystals typically highly modified, to 1 cm; granular.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:Typically in contact metamorphic zones in limestones and dolostones associated with felsic, or more rarely, alkalic plutonic rocks, especially where metasomatism has introduced Fe, B, and F.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Humite information at mindat.org
Significant Gem Localities
Vietnam
 
  • Yenbai Province (Yen Bai Province)
Garnier, V., Giuliani, G., Ohnenstetter, D., Fallick, A.E., Dubessy, J., Banks, D., Vinh, H.Q., Lhomme, T., Maluski, H., PĂȘcher, A., Bakhsh, K.A., Long, P.V., Trinh, P.T., and Schwarz, D. (2008): Ore Geology Reviews 34, 169-191.
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