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Question
Are you able to distinguish what type of rock (igneous, metamorphic, or sedimentary) and the rock name if the list to find it is given? I will provide the pictures of the rock.

https://www.dropbox.com/sh/e889gf8tpm1su65/X8ivAagS5H

Answer
Dear Daniel,
Thanks for questioning.

It is not at all difficult for a geologist to identify a rock specimen. However, it is called "hand specimen study" followed by "microscopic study" which lead to conclusion. I don't think any geologist will ever correctly identify a rock simply seeing the picture.

Having said that, may i tell you, we may try to guess wildly a few of them - like mica schist, biotite schist, coal, limestone, in broad term if the picture is perfect and vivid. But then, there exist chances of mistake. For example, a bedded limestone and a rock having ortho quartzite-thin shale alteration may look alike in picture. But a few physical characteristics and a few chemical tests would very surely discriminate between theses two.

Therefore, it shall be prudent not to try anything like that.

Your intention may be noble. But the outcome may be erroneous.

Thanks and regards.

Amit

Careers: Geology

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Amit Roy Chowdhury

Expertise

I shall answer general questions related to clastic sedimentology. I shall be specially interested to reply to any question on continental deposits, particularly fluvial deposits. As I have about 15 years of experience in working in the field of petroleum geology, I shall love to answer questions related to exploration of hydrocarbons in the aforesaid sedimentary environment. To do so, I may guide how to use all geoscientific data - geological, seismic data and electrolog data acquired in the area of study. However, as I have no exposure in lab work, I may be excused from answering any question akin to sed lab,pal lab or chem lab.

Experience

25 years together in petroleum E&P industry

Organizations
ONGC

Education/Credentials
M. Sc. (Applied Geology) & MBA

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