Definition
Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks
Troctolite is a mafic intrusive rock type. It consists essentially of major but variable amounts of olivine and calcic plagioclase along with minor pyroxene. It is an olivine-rich anorthosite, or a pyroxene-depleted relative of gabbro
Origin
Western Australia, Minnesota
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Discoverer
Unknown
Christian Leopold von Buch
Etymology
From Jaspilite (Mineral), a compact siliceous rock which resembles jasper
From German Troklotit, from Greek trōktēs, a marine fish (taken to be trout)
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock