Minerals & Gemstone 480x104

Advertising Information

Clinohumite with Spinel

The Mineral clinohumite

Clinohumite is a member of the humite group, and is chemically similar to Humite, with a very slightly modified chemical formula and different crystal form. Though Clinohumite is not a common mineral, it occurs more frequently and in better examples than its namesake Humite.
Chemical Formula (Mg,Fe2+)9(SiO4)4(F,OH)2
Composition Magnesium iron fluoro-hydroxyl-silicate
Color Dark red, reddish-brown, brown, yellowish-brown, yellow
Streak White
Hardness 6
Crystal System Monoclinic
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Crystals may be tabular and prismatic, usually as complex crystals with rounded faces. Crystals may also be twinned in a vertical plane. Most frequently in grainy and crude masses.
Transparency Transparent to translucent
Specific Gravity 3.2 - 3.4
Luster Resinous, vitreous
Cleavage 3,1
Fracture Subconchoidal to uneven
Tenacity Brittle
Other ID Marks May fluoresce yellow to orange in shortwave ultraviolet light.
In Group Silicates; Nesosilicates; Humite Group
Striking Features Color, crystal habits, and mode of occurrence
Environment In marble deposits of metamorphosed limestones and dolomites.
Rock Type Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2

Clinohumite AUCTIONS

 -  Form of Clinohumite lacking fluorine it its chemical structure, containing only hydroxyl at the end of its chemical formula. Hydroxylclinohumite is also deficient in iron, which is usually present in Clinohumite. Hydroxylclinohumite was classified in 1998 and is considered an individual mineral by the IMA.

Clinohumite is of interest to collectors, especially the rare transparent forms which are highly collectible. Gems for collectors are ocassionally cut from transparent stones.

The best formation of Clinohumite, in the form of outstanding orange crystals with good transparency, is from Kukh-i-Lal, Pamir Mts, Tajikistan. Sharp crystals and grains of Hydroxylclinohumite of excellent quality come from Sar-e-Sang, Kokcha Valley, Badakhshan Province, Afghanistan. Clinohumite associated with contrasting dark Spinel is found in the Hunza Valley, Gilgit, Pakistan.

Gemmy Clinohumite microcrystals have been found at Monte Somma, Vesuvius, Italy; and orange crystal grains from the Málaga region, Andalusia, Spain. In the U.S., large crystal clusters, almost always associated with Spinel, were found at the Rudy farm locality, Edenville, Orange Co., New York. In Canada, large Clinohumite crystals, including rare twinned crystals, have come from a one-time find at Essonville Line, near Wilberforce, Haliburton Co.

Calcite, Spinel, Phlogopite, Diopside

clinohumite PHOTOS
DISCUSSIONView Forum | Post to Forum
Have a question about Clinohumite? Visit our Q&A Community and ask the experts!

To sponsor this page, click here.

Let us know how we can update this page
(Click for more details)
We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.