- Identification Of Rock in the Field:
Broadly we have categorized the rocks in the field in two classes for identification point of view:
i) The rocks which give Fizzes with acid like limestone and Marble
ii) The rocks which don"t fizz with acid
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| Rock Classification in the Field |
First we identify the rock above said parameters and if the rock dont fizz with acid then further devided in three parameters which dont fizz with acid as below-
a) Rocks made of very fine grains rock which are soft and crumbly- (SHALE or MUDSTONE)
b) Rock made of Rounded grains- if small rounded sand like grains (SANDSTONE)
- if rock have large rounded pebbles (CONGLOMERATE)
c)Rocks made of Crystal grains which are tightly held together in close filling pattern- this is further decided in two class - 1.Grains are not arrange in layers: Pale colour with large crystals (GRANITE)
Dark colour with small crystals (BASALT)
2. Grains are arrange in layers: * White colour very hard rock, drived due to metamorphism of sandstone(QUARTZITE)
* Grey or purple colour very hard brittle in nature and splits in to thin sheets drived due to metamorphism of shale/mudstone(SLATE)
* Silver colour with flaky grains (Schist)
*Rock having alternate dark and light bands (GNEISS)
Hope you will broadly identified the rock in the field based on these parameters.
