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It is generally agreed that glass beads were present in Sub-Saharan Africa by at least 300 AD, some having been imported from the Middle East and South East Asian regions. [1] Transported by sea, shipments arrived to coastal ports such as Mtwapa and Ungwana in Kenya and were then distributed inland via local trade networks and kinship relations ...
Krobo powder glass beads, bicones. Powder glass beads are a type of necklace ornamentation. The earliest such beads were discovered during archaeological excavations at Mapungubwe in South Africa, and dated to between 970 and 1000 CE. Manufacturing of the powder glass beads is now concentrated in West Africa, particularly in the Ghana area.
Often referred to as blue asbestos, it is considered the most hazardous. The association between blue asbestos and mesothelioma was established by J. C. Wagner, C. A. Sleggs, and P. Marchand by 1960. [7] Crocidolite asbestos was mined in South Africa, Bolivia, and Wittenoom, Western Australia.
Ajoite in quartz from Messina District, South Africa (size: 16.9 x 3.7 x 3 cm.) Ajoite is named after its type locality , the New Cornelia Mine in the Ajo District of Pima County , Arizona . Type material is conserved at the National Museum of Natural History , Washington DC, US, reference number 113220.
Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
The Struben brothers were engaged in active mining operations at Confidence Reef until 1888, extracting gold from a quartz vein that they had discovered. Following their departure, the site retained its importance within South Africa's mining history.
A selection of glass beads Merovingian bead Trade beads, 18th century Trade beads, 18th century. A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing. Beads range in size from under 1 ...
The emergence of a ruling class during this period marked the beginning of the first southern African state at Mapungubwe Hill (AD 1220–AD 1290). [1] These sites together constitute the core of a World Heritage Site , recognised for its natural and cultural landscape deemed to possess great value.
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