Question

What was the sources of the black clay​

Answer 1

Answer:

Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to particle size and geometry as well as water content, and become hard, brittle and non–plastic upon drying or firing.

Answer 2

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Barro negro pottery ("black clay") is a style of pottery from Oaxaca, Mexico, distinguished by its color, sheen and unique designs.

The earth! Clay is the result of feldspathic rock that has been broken down over many eons, by water, snow, ice, wind, and erosion - weathering. Feldspar , one of the common clay-forming minerals, comprises about 60% of the earth's crust.