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Orichalcum or aurichalcum / ˌ ɔːr ɪ ˈ k æ l k ə m / is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias of Plato.Within the dialogue, Critias (460–403 BC) says that orichalcum had been considered second only to gold in value and had been found and mined in many parts of Atlantis in ancient times, but that by Critias's own time, orichalcum ...
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Our world is a pretty special place, full of breathtaking sights, awesome people, vibrant plants, and majestic wildlife. However, we tend to take it for granted, forgetting how incredible it is.
One page that is dedicated to celebrating photography from history is Old-Time Photos on Facebook. This account shares digitized versions of photos from the late 1800s all the way up to the 1980s.
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Aurichalcite is a carbonate mineral, usually found as a secondary mineral in copper and zinc deposits. Its chemical formula is (Zn,Cu) 5 (CO 3) 2 (OH) 6. The zinc to copper ratio is about 5:4. [3] Copper (Cu 2+) gives aurichalcite its green-blue colors. [5]
[1] Pictures nominated by the public were reviewed by editors who then compiled 100 photographs that they felt portrayed technological photographic achievements, documented historic events and accomplishments or have achieved iconic cultural and, symbolic status. [1]
Timaeus; Unlike the other speakers of the Critias, it is unclear whether Timaeus is a historical figure or not.While some classicists regard him as definitively historical, [4] others guess that "Plato's picture of him has probably borrowed traits from various quarters". [5]