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Just wondering what kind of rock this is. I found it near an old home that was built in 1882 in Kansas. It is very heavy and it has a dark green tint to it. Probably about 6 lbs.


closed as unclear what you're asking by JeopardyTempest, Fred, Jan Doggen, daniel.neumann, Semidiurnal Simon Oct 22 '18 at 12:22

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  • 3
    $\begingroup$ Please read this and improve your question. Not that mentioning weight without any indication of size is pretty useless. $\endgroup$ – Jan Doggen Sep 19 '18 at 8:03
  • $\begingroup$ What is the density and Mohs hardness? $\endgroup$ – Chloe Dec 26 '18 at 23:19

There are a number of common rock forming minerals that are green. I have listed most to least likely match to your rock.

  • Chlorite
  • Glauconite
  • Serpentine
  • Phengite
  • Actinolite
  • Diopside,
  • Epidote
  • Olivine (Peridot)
  • Nephrite
  • garnet

There are some interesting igneous and metamorhic rocks that are found in Kansas. Igneous rocks (peridotite and granite) and metamorphic rocks (quartzite and hornfels) can be found in Kansas according the geological survey.

Your rock looks similar to a hornfel.

Hornfels is a metamorphic rock formed by the contact between mudstone / shale, or other clay-rich rock, and a hot igneous body, and represents a heat-altered equivalent of the original rock.


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