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Gray, white; black, ...
6½ - 7
"Chert, perhaps originally chirt, is believed to be a local English term that was taken into geological use. It may be of onomatopoeic origin. The name chert may be of more recent origin than flint, and unlike flint, is not found in literary usage. It was well established in meaning in 1679 ..." (Frondel, C., 1962, The System of Mineralogy, v. 3, John Wiley & Sons, p. 223.)
A dense, hard siliceous-rock with low porosity.

Classification of Chert

Sub-divisions of Chert

Mineralogy of Chert

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Silica > Opal-CTSiO2 · nH2O
Silica > QuartzSiO2

Physical Properties of Chert

Waxy, Dull
Diaphaneity (Transparency):
Translucent, Opaque
takes good polish, then vitreous luster
Gray, white; black, brown and other colors due to staining
White or lightly colored
Hardness (Mohs):
6½ - 7
None Observed
Splintery, Conchoidal, Sub-Conchoidal

Other Names for Chert

Name in Other Languages:
Simplified Chinese:硅质岩

Internet Links for Chert URL:
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