31. As an alternative to animal products, bentonite, a clay mineral , can be used to clarify the wine. 32. Essentially, slate forms when the clay minerals in shale are out under increased pressure with high temperatures. 33. Ultisols can have a variety of clay minerals , but in many cases the dominant mineral is kaolinite. 34. Clay minerals need water to form, so the area may once have contained large amounts of water.35. It is cemented by clay minerals . 36. While 60-70 % of the shale consists of clay minerals , the balance is made up of organic matter. 37. Shales are typically composed of variable amounts of clay minerals and quartz grains and the typical color is gray. 38. The OMEGA experiment on Mars Express discovered clay minerals ( phyllosilicates ) in a variety places in Aureum Chaos. 39. From 1947-1949 there were again unsuccessful attempts to mine the remaining clay minerals in eastern field of the mine. 40. A layer of red sediment with clay minerals remains from this time on flat, inland areas of the park.
