There are many types of this rock so they may be named for mineral comprising the actual rock for example Mica schist

and igneous rocks

named Campo del Cielo (Heaven’s Field in Spanish) that was found in 1576 by Spanish explorers

Siderite and Quartz Crystal Cluster

spiritual vision

Okenite and Gyrolite on Quartz and Prehnite in Geode | 3.78 Kg | Dindoshi, India Murchison There are many types ofThis is an amazing, large cluster of Okenite with Gyrolite, Quartz and Prehnite Geode Crystal from Dindoshi Quarry, Mumbai, India. This is a high quality geode with outstanding, perfect okenite spheres and tons of Prehnite. Since this is a geode type specimen all of the okenite hairs are perfectly intact with no damage to any crystal. Would be a beautiful addition to any collection. Name: Okenite with Gyrolite on Quartz and Prehnite Geode Crystal