Specimen #2031

Name: Groutite on Petrified Wood

Type: Mineral

Locality: Black Water Mine, Black Mesa Basin, Apache Co., Arizona, USA

Favorite? N

Fluorescent? N

Size: 9.5 x 4.8 x 4.0 cm

Weight: 181

Acquired: 2010-07-29

Source: Arkenstone Auction

Label: N

Comment: Groutite is a rare manganese oxide. Lustrous needles of groutite, to 3 mm, are richly scatttered on the crest of both sides of the banded, quartz-replaced petrified wood! I have seen just a few specimens of this material before, and in every case it sold immediately - this is rare, hard to obtain material. This sculptural, VERY LARGE specimen for the species is from a remarkable and so far unique find in 1975. A miner who"d worked in the area for years brought in a small lot of specimens to a rock shop owned by Lolette Dalbeck in Ridgecrest, California. Ex Mullane Collection.

Minerals: Groutite (Mn⁺⁺⁺O(OH)) Quartz (SiO₂)

There is one picture on file

M02031-01.jpg:

Groutite on Petrified Wood, Black Water Mine, Black Mesa Basin, Apache Co., Arizona - 9.5 x 4.8 x 4.0 cm