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Large Complex Chondrodite Crystal

The Mineral chondrodite




Chondrodite is the most prevalent and well-known member of the humite group. It is named for the Greek term "chondros", meaning grainy, alluding to the frequent grainy habit of this mineral.
Chemical Formula (Mg,Fe2+)2(SiO4)2(F,OH)2
Composition Magnesium iron fluoro-hydroxyl-silicate
Color Brown, reddish-brown, yellowish-brown, mustard-yellow, pale yellow, yellowish-gray, greenish-brown, orange
Streak White
Hardness 6 - 6.5
Crystal System Monoclinic
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Crystals are usually complex, with faces in an oval "saucer" form. Less commonly tabular, and rarely prismatic. Often in grainy and crude masses. 
Transparency Transparent to nearly opaque
Specific Gravity 3.1 - 3.2
Luster Resinous, vitreous
Cleavage 3,1
Fracture Subconchoidal to uneven
Tenacity Brittle
Other ID Marks May display yellow fluorescence.
In Group Silicates; Nesosilicates; Humite Group
Striking Features Mode of occurrence, hardness, low density
Environment In marbles, metamorphosed dolomites and hornfels, serpentine deposits, and altered volcanic rock.
Rock Type Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 2


Chondrodite AUCTIONS



USES
Good examples of this mineral from classic localities are highly desirable to collectors.

NOTEWORTHY LOCALITIES
Though Chondrodite is the most common member of the Humite Group, it is only found in collectible specimens in few localities throughout the world. Bright orange-yellow Chondrodite comes from the marbles of Mogok, Burma (Myanmar); and brown Chondrodite from the Sar-e-Sang area in the Koksha Valley, Badakhshan Province, Afghanistan.

Brightly colored, small crystals have come from Kaveltorp Mine, Kopparberg, Västmanland, Sweden; and the the type locality for this mineral is Pargas, Finland. Transparent Chondrodite microcrystals were found in the San Vito Quarry, Monte Somma, Vesuvius, Italy. Reddish-brown, transparent Chondrodite comes from the Palabora mine, Phalaborwa, Limpopo Province, South Africa. 

In the U.S., the most famous and classic locality for Chondrodite is the long-closed Tilly Foster Mine in Brewster, Putnam Co., New York. This location has produced the best crystals of this mineral. Large crystals and grainy groups have come from several places in the Franklin marble, including Amity, Orange Co., New York; and across the state line at Franklin, Ogdensberg, Sparta, and Newton, all in Sussex Co., New Jersey.

In Canada, small crystals in marble come from the Cardiff Mine, Haliburton Co., Ontario.

COMMON MINERAL ASSOCIATIONS
Calcite, Magnetite, Spinel, Phlogopite, Diopside, Serpentine, Clinochlore, Graphite

DISTINGUISHING SIMILAR MINERALS
Garnets - Generally harder, crystals less complex.
Zircon - Harder and different crystal shapes. 


chondrodite PHOTOS
 
ADDITIONAL RESOURCES
 
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