Studies of Flint Clays And Their Associates
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Flint clay, Mt. Savage, Md. , between crossed nicols. Shows development presumably by hydro-micas along a slip plane X 160.
Fig. 2. Semi-hard clay, Olive Hill, Ky. , by di rect light. Shows cloudy areas which may repre- sent weathered feldspars X 80.
STUDIES OF FLINT CLAYS AND THEIR ASSOCIATES. 323 ably are not caused by the weathering of feldspar grains in situ, but represent instead intergrowths of rather large crystals.
The section is crossed by several cracks, which evidently represent slip...ping planes, as indicated by the drag of the minerals along them (Plate IV, Fig. I). These cracks must have served as passageways for solutions for the reason that they are usually tinted strongly by limonite.
The de terminable minerals are (i) kaolinite in plates, prisms and fans, more commonly "ribbed" by the hydro-micas; (2) hydro-micas in individual flakes or grouped in fan-shaped aggre- gates. The areas described above are composed of hydro- micas. This mineral apparently makes up from 50 to 60 per cent, of the clay.
What to read after Studies of Flint Clays And Their Associates?
You can find similar books in the "Read Also" column, or choose other free books by Sidney Longman Galpin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Flint clay, Mt. Savage, Md. , between crossed nicols. Shows development presumably by hydro-micas along a slip plane X 160.
Fig. 2. Semi-hard clay, Olive Hill, Ky. , by di rect light. Shows cloudy areas which may repre- sent weathered feldspars X 80.
STUDIES OF FLINT CLAYS AND THEIR ASSOCIATES. 323 ably are not caused by the weathering of feldspar grains in situ, but represent instead intergrowths of rather large crystals.
The section is crossed by several cracks, which evidently represent slip...ping planes, as indicated by the drag of the minerals along them (Plate IV, Fig. I). These cracks must have served as passageways for solutions for the reason that they are usually tinted strongly by limonite.
The de terminable minerals are (i) kaolinite in plates, prisms and fans, more commonly "ribbed" by the hydro-micas; (2) hydro-micas in individual flakes or grouped in fan-shaped aggre- gates. The areas described above are composed of hydro- micas. This mineral apparently makes up from 50 to 60 per cent, of the clay.
What to read after Studies of Flint Clays And Their Associates?
You can find similar books in the "Read Also" column, or choose other free books by Sidney Longman Galpin to read onlineMoreLess
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