i.d my rock please

[alan p]

Found this rock late 2016 in Norfolk england but cant remember where, anyway put in box and just come across it so I hope some ideas or answer to what it is, its black with round white/clear glassy blobs weighs 35grms very attracted to magnet approx 2ins across 1/2inch thick, on closer inspection there looks like tiny soft rust spots but only a few, no visible white metal but lot of very tiny specks of gold looking material which is possibly a pyrite, the white pieces are clear like glass close up poss quartz, I gave it a twist and half of it crumbled and other half solid !.

 

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[DDancer]

Remindes me of degraded basalt. Magnetism is probably due to magnetite in the material. The white inclusions could be chalcedony or calcite, a hardness test and an acid test would point that out. Dont see the possible pyrites but it would not surprise me. Got a peacock or eyeball pattern to it. Neat.

 

[alan p]

I agree DDancer I thought magnetite, the photos were taken before I broke it and the gold coloured specks appeared on the inside and can only see the specks with strong magnifying glass, I've since poked the specks with a needle and they flake away so I def think pyrite, basalt yes, can't do tests but thanks for your reply much appreciated.