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The Mineral chondrodite

Large Complex Chondrodite Crystal

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

Color

Brown, reddish-brown, yellowish-brown, mustard-yellow, pale yellow, yellowish-gray, greenish-brown, orange

Crystal System

Monoclinic

Properties

Streak
White
Hardness
6 - 6.5
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.

Crystal Habits

Crystals are usually complex, with faces in an oval "saucer" form. Less commonly tabular, and rarely prismatic. Often in grainy and crude masses. 

3D Crystal Atlas

Additional Information

Composition
Magnesium iron fluoro-hydroxyl-silicate
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

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.

Distingushing Similar Minerals

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

chondrodite Photos



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