Amethyst Crystal Mineral Specimen

Rounded pebble half containing a Dactylioceras commune specimen. 308 grams, 80 mm



From Yorkshire coast. From a Lincolnshire, UK, collection.

Comprising lacquered porphyry slices of irregular shape, cut and polished on both sides, probably recycled material mined in ancient Roman times between the 1st and 5th century A.D. 176 grams total, 37-97 mm



From Egypt. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.

Mons Porphyrites (today Jabal Abu Dukhkhan) is the mountainous site of a group of ancient quarries in the Red Sea Hills of the inhospitable eastern desert in Egypt, a five day trip from the Nile during Roman times. They were discovered by Caius Cominus Leugas in 18 A.D., and during the Roman Empire the mines officially belonged to the emperor and were the only known source of the Imperial Porphyry, Mons Porphyrites. This dark purple stone was associated with royalty and used for prestigious sculpture and architecture. The location of the mines was lost some time in the 5th century, and rediscovered in the early 19th century. Excavations in the area have revealed the well-preserved quarries and the dwelling places of the quarry men, and also thousands of ostraca have been discovered containing messages that provide details of how the quarrying took place, and of how the highly skilled quarrymen ordered their food.

Comprising: a reconstructed assemblage matrix with Liparoceras ammonites, bivalves, and a belemnite; an ammonite partial; a gryphaea fossil; and a matrix with mica and aventurine. 4.16 kg total, 5.9-25 cm



Acquired from older English collections via the UK art market since the mid 1970s. From the private collection of Peran Dachinger, thence by descent. From the family collection of a Maida Vale lady, UK.