Porphyry Mine in Lessines, Belgium
Mine / Quarry for Porphyry at Lessines, Belgium. Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass. The larger crystals are called phenocrysts. In its non-geologic, traditional use, the term porphyry refers to the purple-red form of this stone, valued for its appearance. The term porphyry is from Greek and means purple'. Purple was the color of royalty, and the Imperial Porphyry was a deep brownish purple igneous rock with large crystals of plagioclase. This rock was prized for various monuments and building projects in Imperial Rome and later
Picture No
10285145
Media ID
45526252
Size
4677px x 3099px
(2.9MB)
Credit
Mary Evans / Grenville Collins Postcard Collection
Source
Unattributed postcard
Date
1920s





























