How can stones be cleaned of lichen growth?

How can stones be cleaned of lichen growth? Images

How can stones be cleaned of lichen growth?

How can stones be cleaned of lichen growth? Description

We live in Colorado on 6 acres with lots of local sand (http://maplered.com) Stone (http://g603.net) . My wife has the
idea to collect this Stone (http://g603.net) and (http://maplered.com) arrange with a local Stone (http://g603.net) mason to lay a
Stone (http://g603.net) floor and (http://maplered.com) build fireplace out of this local rock.  This seems very
labor intensive.  Do you think we can find someone to do it.  How is
sand (http://maplered.com) Stone (http://g603.net) for interior use, especially a floor.  Will it show stains, can it
be adequately sealed?  Are airborne silicates a concern?  How can Stone (http://g603.net) s be
cleaned of lichen growth?

Lou, Durango