31. Earlier, the instrument had detected clay minerals . 32. They are clay minerals , also called phyllosilicates. 33. Clay minerals also bind particles of organic material to their surface, making them less accessibly to microbes.34. The composition of porcelain is highly variable, but the clay mineral kaolinite is often a raw material. 35. While 60-70 % of the shale consists of clay minerals , the balance is made up of organic matter. 36. It is cemented by clay minerals . 37. As clay minerals promote biomineralization, the presence of bacteria and clay minerals resulted in calcium hydroxyapatite and calcite precipitates. 38. As clay minerals promote biomineralization, the presence of bacteria and clay minerals resulted in calcium hydroxyapatite and calcite precipitates. 39. Traditional ceramic raw materials include clay minerals such as kaolinite, more recent materials include aluminium oxide ( alumina ). 40. A layer of red sediment with clay minerals remains from this time on flat, inland areas of the park.
