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Geology/Continued Test on Rock

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Question
Cut Rock
Cut Rock  
I was unable to find larger quantities of hydrochloric or sulfuric acid but in the meantime I did split an example.  It was very hard to split with a hammer and took many repeated blows.  Inside it is quite light and fine-grained.Almost looking like the inside of a cracked fine porcelain china.  I enclose a picture of the latest experiment.

Answer
The splitted sample looks like  a fine grained quartzite,  it does not appear to be vein quartz, chalcedony, agate, chert etc.
Possibility of it being a man made material still cannot be ruled out.
If your curiosity still persist, you can give one part of the splitted sample to petrological laboratory of any Geology Department of college/university with a request to identify it under microscope. The thin section study (petrological) can identify whether it is man made material or quartzite or any other un-common rock.
thanks

Geology

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N.K.Agarwal

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Would be happy to answer : General Geology, Engineering Geology, Economic Geology, Geomorphology, Geoenvironment, Tectonics, Natural Resources inclusive of Rocks & Minerals, Exploration, Science Policy etc.

Experience

Geological-Geotechnical Solutions and professional advice. I have over 34 years of professional experience of working as a geologist in diverse mountainous terrain. I have professional skills for planning. programming, executing and monitoring of : (1) Engineering Geological investigations in Hydropower and Developmental projects, (2) Landslide and Disaster Management etc. (3) Natural Resource Management and Programming (4) Geological Mapping (5) Geoenvironmental Management (6) Mineral Exploration (7) Water Resources Management, (8) Integrated Watershed Management, (9) Training on - Natural Resource Management, Geoenvironmental Management, Waste Management, Geohazards, Geotechnical Investigations, Data acquisition & interpretations, (10) R&D Initiatives and Societal issues etc.

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ex-Geological Survey of India. Retired Director now Geo-Consultant and Advisor -HIGEOS India

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Departmental Publications mostly

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M.Tech.(Applied Geology), University of Roorkee (now IIT Roorkee).

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Worked in the Geological Survey of India for aabout 32 years. Presently - GeoConsultant & Advisor - HIGEOS India

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