Holbrook, Navajo Co., Arizona, USA

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Chalcedony, Chalcedony (Var: Petrified Wood)
	Petrified Forest, Petrified Forest National Monument, Holbrook, Navajo Co., Arizona, USA Close up of "rainbow" petrified wood from the Petrified Forest National Park. Diameter >1 m (compare grass and pebbles).
	Photo ID: 154875 View Count: 91
Chalcedony (Var: Petrified Wood)
	Holbrook, Navajo Co., Arizona, USA Section of a petrified tree trunk with external bark from the original wood still distinctly visible. The inside has been replaced by a red-yellow agate - the most highly sought-after color for petrified wood. With old label from Hugh Ford. No damage. Ex. Robert C. Linck (1905-1970); Ex. Hugh Ford (1885-1966). Overall size of mineral specimen: ...
© 2003 John H. Betts	Photo ID: 10565 View Count: 2036
Chalcedony (Var: Petrified Wood)
	Holbrook, Navajo Co., Arizona, USA 3.8 x 2.1 x 1.6 cm. An UNUSUAL and UNIQUE fossil from Holbrook, Arizona! This is a polished slice from vanadium-rich petrified tree limb. The unique green color is caused by vanadium and the bark on the outer rind is very well preserved. The piece is probably from the famous Petrified Forest.
© Rob Lavinsky	Photo ID: 137974 View Count: 167
Chalcedony (Var: Petrified Wood)
	Holbrook, Navajo Co., Arizona, USA 4.0 x 2.0 x 1.5 cm. An UNUSUAL and UNIQUE fossil from Holbrook, Arizona! This is a vanadium-rich petrified tree limb. The unique green color is caused by vanadium and the bark on both sides is very well preserved. You can see the distinct knots, where smaller limbs were once attached and the corrugated nature of the bark. The piece is probably ...
© Rob Lavinsky	Photo ID: 148296 View Count: 130
Chalcedony (Var: Petrified Wood)
	Holbrook, Navajo Co., Arizona, USA 10.1cm x 6.7cm x 5.8cm Full limb cast. This is a polished slice from vanadium-rich petrified tree limb. The unique green color is caused by vanadium and the bark on the outer rind is very well preserved. It is my understanding that there was a very limited find of this material on one of the Indian Reservations. Possible V. WOODWORTHIA. ...
© Danny Jones	Photo ID: 238018 View Count: 53
Groutite : Mn³⁺O(OH)
	Holbrook, Navajo Co., Arizona, USA Matrix of petrified wood 4.1cm x 3.4cm x 1.1cm nearly covered with groutite crystals up to 1mm long. Specimen purchased in 1978 at the Tucson Gem and Mineral Show. Dave Richerson specimen and photograph.
© D. Richerson	Photo ID: 32861 View Count: 519
Groutite : Mn³⁺O(OH)
	Holbrook, Navajo Co., Arizona, USA A 3.3 mm long crystal on petrified wood. From near the Petrified Forest-Painted Desert National Park. Robert Meyer specimen and photo.
© 2004 ROM	Photo ID: 15169 View Count: 405
Groutite : Mn³⁺O(OH)
	Holbrook, Navajo Co., Arizona, USA Groutite is an uncommon manganese oxide, rare in sharp crysatls and really known from just a few locales in good form. You can really see here the superb elongated crystals of groutite, to 6 or 7 mm, tucked safely into crags of quartz-replaced petrified wood! I have seen just 3 specimens of this material before, and in every case it sold ...
© Rob Lavinsky	Photo ID: 41012 View Count: 266
Groutite : Mn³⁺O(OH)
	Holbrook, Navajo Co., Arizona, USA An excellent and sculptural specimen of petrified wood dotted with rare groutite crystals! Superb lustrous, metallic , elongated crystals of groutite, to 5 mm, tucked safely into crags of quartz-replaced petrified wood! I have seen just 4 specimens of this material before, and in every case it sold immediately - this is rare, hard to obtain ...
© Rob Lavinsky	Photo ID: 46846 View Count: 200
Groutite : Mn³⁺O(OH), Ramsdellite : Mn⁴⁺O₂, Chalcedony (Var: Petrified Wood)
	Holbrook, Navajo Co., Arizona, USA An excellent example of two rare manganese oxide minerals scattered on a matrix of petrified wood. Both Ramsdellite & Groutite are quite rare. This specimen features Groutite crystals to 3.5 mm. specimen size = 10.5 x 2.3 x .6 cm.
© Russell G. Rizzo	Photo ID: 112835 View Count: 103