This same weekend with crystal hunting out of Elliston, Montana hills the Fudge Family from Great Falls were at a camping retreat for the hearing impaired and deaf at Lolo Hot Springs and they had the opportunity to dig for crystals as well in the volcanic hills around the area.
Apparently the shady side of a rock has the crystal formed as one cannot find them on the sunny side. Talking with the locals who can show you where to dig, one can get crystals there as well. Althought the family thought the crystals from Elliston were bigger and better.
Just fun to gather them fresh from the earthy vein found in both places.