horsetail ore

horsetail ore

[′hȯrs‚tāl ‚ȯr]
(geology)
An ore occurring in fractures which diverge from a larger fracture.
References in periodicals archive ?
1973) Distribution, mineralogy, and structural features of the horsetail ore bodies, Butte district, Montana.
At the Berkeley pit, supergene enrichment affected Main Stage veins and horsetail ores as well as their wall rocks.
In more recent years the mineral was found ia even greater abundance in the deep horsetail ores of the East Colusa mine; most colusite specimens in modern collections came from this property.