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In general, the granite you'd source from a supplier will be rated as level one, two, or three—level one is considered the lowest tier and comes in at a budget-friendly price of $30-$40 per ...
Based on their color index, rocks can be classified as melanocratic (higher color index), leucocratic (lower color index), or mesocratic (middle color index), as well as hololeucocratic and holomelanocratic (extremes to either side). [1] For example, leucocratic granite would be brighter and have a lower color index than regular granite. [1]
The biotites in I-type granites are greener in general than those in S-type, both in hand sample and in plane polarized light. More mafic composition granites, those with a higher color index, contain more hornblende and biotite. [1] Hornblende is a typical I-type granite mineral which never occurs in S-type granite.
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Higher color indices correlate with higher plagioclase to alkali feldspar ratios. [7] The most common high color index mineral in an S-type granite is biotite. [1] [4] Figure 7. Cross-polarized light photomicrograph of sample CV-114 from the S-type Strathbogie Granite with quartz and feldspar displaying a granophyric texture.
Different specific granite types have differing propensities to weather, and so differing likelihoods of producing decomposed granite. The parent granite material is a common type of igneous rock that is granular, with its grains large enough to be distinguished with the unaided eye (i.e., it is phaneritic in texture); it is composed of ...
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