Greenockite

Al Mar,
Your English is substantially better than that of most non native English speakers who come to this message board. You might also post the same images on the Identity Help forum. You might get more people helping with ideas. I don't know what you little brown crystals are. Grenockite crystal are generally hexagonal and yours don't seem to fit that category. I am thinking perhaps sphalerite. Have you tried a little acid on on a cotton swab to eliminate calcite as a possibility, though I don't think they are calcites. I wonder if they might be sphalerite. I think you may have to have them tested to be sure.

Rock Currier
Crystals not pistols.

I was register in this forum, I am Al mar.
In Biscay there is a location for greenockite, but there aren´t cristals. It is the Angela mine on Matienzo village,Spain.

Dear Al Mar,

Great photos! They are more likely to be wurtzite.

Best Wishes, Van King