ORBICULAR GRANITE SLAB

ORBICULAR GRANITE SLAB

A great West Australian ORBICULAR GRANITE SLAB.  This piece is unpolished showing its natural beauty.  A perfect gift for a lapidarist or carver.  Rare and hard to come by, Bargain!

Location:
Mount Farmer, Western Australia.

Dimensions:
25cm x 14cm x 1.3cm, 1030g.

Orbicular granite from Mt. Farmer, Western Australia

Orbicular granites are spectacular geological enigmas.  They occur from place to place as small pods, trains, bands, lenses, pipes and patches, not uncommonly along or close to margins of granitic intrusions.  They occur on all continents in rocks of many ages. Orbicular granites are so fascinating geologically because of the structural complexities and variations in mineral composition within and between individual deposits. Significantly, even though orbicular structures have been recorded in many rock types from a wide range of physical and tectonic settings, no two orbicular granite occurrences are alike.
One significant feature of the 2.6 b.y. old Mt. Farmer orbicular granite is its overall freshness.  In this aspect it is unlike most orbicular granites which are characteristically substantially altered by the large amount of magmatic water associated with its formation, or by subsequent hydrothermal activity.  This freshness translates to a polished finished quality which is at least very good.