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My son found this in our front yard. We live in Richardson, TX. It is brittle and little gold flecks fall from it when you handle it. The darker smooth parts are like a mirror. The clear part at the top in this image is prism-like. The parts in the picture that look brown are actually golden enter image description here

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    $\begingroup$ Welcome to Earth Science SE! Please check the guide to ask identification questions and try to explain as much of those questions as possible: meta.earthscience.stackexchange.com/questions/124/… $\endgroup$ – arkaia Oct 19 '16 at 2:56
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    $\begingroup$ There appear to be at least 5 different comonents to this. First thing to do is measure it's density = weight in air divided by weight of equivalent volume of water (by displacement). Second thing is to determine relative hardness of each component. Does it scratch, or can it be scratched by, a steel penknife, brass screw, and fingernail? Thirdly, get a piece of unglazed white porcelain, and scratch it with each component. What colour is each scratch (the streak). It might also help to get some closer photos. Do you have any information on the kind of local geology? Then we can assess better. $\endgroup$ – Gordon Stanger Oct 19 '16 at 6:23
  • $\begingroup$ I'd recommend you to take it to a geologist nearby your university where he or she can identify for you. Perhaps contact a professor and send him the picture in an email. He or she can repied back to you. He or She can ask you to come and bring that rock or mineral to the office. It looks like you are near University of Texas at Dallas. You can contact them here utdallas.edu/geosciences/faculty $\endgroup$ – PROBERT Oct 19 '16 at 16:51
  • $\begingroup$ It isn't native to Richardson - you're on Austin Chalk there - nice chalky limestone with marine fossils... (the Perot Museum have some large Austin Chalk fossil specimens on display) $\endgroup$ – winwaed Oct 19 '16 at 17:39
  • $\begingroup$ I see quartz crystals in the upper part so that, at least, is a rock. Can't tell about the lower part - looks like wood chips stuck together with dog poop. $\endgroup$ – haresfur Oct 20 '16 at 21:35
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The rock you have looks like hematite with rutile inter-growths. I have a similar specimen from Brazil.

Hematite with rutile from Brazil.

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