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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
October 17, 2020 • 16:29 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir why the answer is not phyllite as it is satisfying all conditions in given question
The three statements below are observation of the same rock sample The rock has intergrown crystal from 2 to 3 millimeters in diameter The minerals in the rock are gray feldspar, green olivine, green pyroxene and black amphibole There are no visible gas pockets in the rock This rock sample is most likely sandstone gabbro granite phyilite
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Sajan sarthak Best Answer
Phyllite is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. It is primarily composed of quartz, sericite mica, and chlorite. In brief phyllite is a folliated sheet thin layered rock having micaceous physllosillicate in it's main composition But here it's describing nesosillicate like olivine and chain sillicate like pyroxene and amphibole ,and these are mainly ferromagnesian sillicates and gabbro is a mafic rock having ferromagnesian sillicates. so gabbro is the answer.
sir, is crystal intergrowth possible in metamorphic rock.?
yes it's possible but not always example Myrmekite texture in metasomatism
sir also may be in granulose texture?.
No in granulose big crystal granular in shape development not intergrowth.