Iolite's Formation and General Information.
Iolite is the word we use
in gemology, but you may also know it under the name cordierite, which is more commonly used
in mineralogy.
Average
Post difficulty
2 min
Post Length
General
Gem-related Field
IOLITE
What Is the Origin of the
Name Iolite?
Cordierite is a magnesium iron
cyclosilicate. It was found in 1813 in extracts from Níjar, Almería (Spain) and was named
after the French geologist Louis Cordier. Another word for blue iolite is steinheilite,
after Fabian Steinheil, Russian military governor of Finland, who noticed that it was a
mineral other than quartz.
Details of these calibrated stones (available in bulk):
Dimensions (in mm): 6x4
Shape: Oval
Dimensions (in mm): 6x4
Shape: Oval
THE QUESTION
How Does It Form?
Iolite is relatively common in hornfels
formed by contact metamorphism of pelitic rocks. This last term was formerly used by
geologists to describe clay-rich, fine-grained clastic sediment or sedimentary rock, such as
mud or mudstone.
Calibrated
Iolites
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