Strange rock

[infotraker]

Hi, a friend of mine found this rock in California. We would like to have it identified.

 

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[MrLee]

Looks like garnet or amethyst/smokey. What area was it found in? You don't have to say the exact location, just the area so we know what minerals are found there.

 

[infotraker]

Skunk Hollow gravel bar on the south fork American River above Folsom lake 3 ft down with the falcon md20 it beeps a metal on one end and beeps every where else as black sand when pulling away with unit. Very magnetic.

 

[MrLee]

Pyrite cluster?

 

[infotraker]

The rocky bumps break off easily,

 

[Eu_citzen]

Is it magnetic? Streak test? (google the latter)