[lukasjacobs (OP)]

please id this.

[RD]

Magnetite ?

[lukasjacobs (OP)]

It is non magnetic.Have not been cut etc. in any way.It looks like red sand in between the crystals,acid in lab could not clean it up.v

[chris]

It's certainly fascinating, although I don't know what it is; can you tell us a bit more about the context in which it was found?

[Bass]

Cubic form of the crystals indicates this is a pyrite nodule. I assume it feels a bit heavier than a regular garden stone of the same size.  Black color is probably goethite oxidizing from the pyrite.

[Bill S]

Have you tried scratching a crystal to check the colour of the streak?

[chris]

this is a pyrite nodule.

What does this mean it's made of? Is it an iron sulphide?

[Bass]

Yes, iron sulfide (FeS2)

[chiralSPO]

I'm pretty sure it's a Borg Sphere, you might want to be careful with it if you don't want to get assimilated...

http://employees.csbsju.edu/rsorensen/modelcitizen/trekships/borg/borgsphere.jpg