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Travertine

Travertine is a white concretionary form of calcium carbonate that is usually hard and semicrystalline. It is deposited from the water of mineral springs[?] (especially hot springs) or streams holding lime in solution. Extensive deposits exist at Tivoli, Italy, near Rome.



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Thomas a Kempis

... made as early as 1447, which still remains in manuscript. The first printed French copies appeared at Toulouse 1488. The earliest German translation was made in 1434 ...

 
 
 
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