	*Beste, Bob (2014) Location Guide for Rockhounds in the United States* (4th ed.) Vol. 4 - Part IV - South Dakota through Wyoming.**	Book (volume)
	Plains, wells drilled deep into this unit provide an inexhaustible supply of cold artesian, Rocky Mountain...beds, excavations, etc.Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...tributary gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE:  area ridges, slopes, stream...stream beds, etc. petrified wood, wood opal;  along the Grand R. though entire Co., regional banks, breaks
	*Beste, Bob (2005) Location Guide for Rockhounds in the United States* (3rd ed.) Vol. 3 - Part III - Ohio through Wyoming.**	Book (volume)
	concerned, Ohio is unique in but a single gemstone, an exceptionally high quality, colorful flint that is...chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...townships of Washington, Virginia, Bedford, Jackson, Jefferson, Bethlehem, Monroe and Clark; on regional
	*Beste, Bob (1996) Location Guide for Rockhounds in the United States* (2nd ed.) Vol. 3 - Part III - Ohio to Wyoming.**	Book (volume)
	concerned, Ohio is unique in but a single gemstone, an exceptionally high quality, colorful flint that is...chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...townships of Washington, Virginia, Bedford, Jackson, Jefferson, Bethlehem, Monroe and Clark; on regional

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Opal-AN from Axton, Henry County, Virginia, USA

Opal-AN from
Axton, Henry County, Virginia, USA