image BXO43.jpg
Kendal: Parkin and Jackson, Cumbria, SD52099329 -- Rock, hand specimen of Shap granite, perhaps from Shap Pink Quarry? Shap Rural, Westmorland, NY557083.
The core is from a gravestone being made by Parkin and Jackson, 12 Appleby Road, Kendal.
Ordovician or Lower Devonian.
The grey crystals are quartz; silcon dioxide, Si02.
The white crystals are feldspars; sodium aluminium silicate, NaAlSi3O8, or potassium aluminium silicate, KAlSi3O8, or calcium aluminium silicate, CaAl2Si2O3.
The black crystals are biotie or perhaps hornblende, complicated lattice silicates.
This is a porphyry; the larger pink crystals are orthoclase feldspar; these phenocrysts indicate a very slow cooling of the igneous intrusion.
(photo 4.9.2009)