Clinohumite

Big Photo

Tajikistan
1.12 carats
© Rarestone.com

Clinohumite was first discovered in metamorphosed limestone ejected from Mt Vesuvius in 1876. The name reflects its monoclinic structure and a similarity to humite.

Transparent gem-quality bright yellow to deep orange clinohumite was found only recently (in the early 1980s, and later in 2000). in the Pamir Mountains of Tadzhikistan. This facet rough has been cut into attractive orange-yellow gems.

A dark brown material has been found in the Taymyr region, Siberia.

Clinohumite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 

Clinohumite Gemstones by Size

This table shows distribution of Clinohumite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.34 cts
Heaviest:3.00 cts
Average:0.91 cts
Total photos:29
Do you have a larger Clinohumite? Why not upload a photo?
0.34ct to 0.61ct0.61ct to 0.87ct0.87ct to 1.14ct1.14ct to 1.40ct1.40ct to 1.67ct1.67ct to 1.94ct1.94ct to 2.20ct2.20ct to 2.47ct2.47ct to 2.73ct2.73ct to 3.00ct
General Information
Chemical Formula
(Mg,Fe
2+
 
)
 
9
(SiO
 
4
)
 
4
(F,OH))
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Clinohumite
Mohs Hardness6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.13 to 3.75
Walter Schumann, Gemstones of the world (2001)
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TenacityBrittle
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityPoor
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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FractureSub-Conchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Clinohumite
Refractive Index1.623 to 1.728
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.024 to 0.041
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismDistinct: brownish-orange - orange to yellow - yellow to colorless
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Dispersion0.021
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Yellow, yellow-brown, brownish-orange, red-brown
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent,Opaque
Walter Schumann, Gemstones of the world (2001)
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LustreVitreous,Resinous
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Fluorescence & other light emissions
Fluorescence (Short Wave UV)Common orangy-yellow
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Fluorescence (Long-Wave UV)Inert
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Clinohumite
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitPrismatic-rounded
Arthur Thomas, Gemstones (2009)
Geological Environment
Where found:The occurrence is in contact zones in limestone or dolomite
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Inclusions in Clinohumite
Euhedral crystals, fingerprints, color zoning, growth lines - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4
Further Information
Mineral information:Clinohumite information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
Tajikistan
 
  • Gorno-Badakhshan
    • Pyandzh River Valley
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 400
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