mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Mineralpedia Details for Whitmoreite

Reset

Whitmoreite

Whitmoreite

Named for Robert William Whitmore, a mineral collector and owner of the Palermo No.1 mine in New Hampshire, USA where Whitmoreite finds its type locality. Whitemoreite can be found in several localities in Europe and the Unites States, including the Tip Top, Big Chief, and White Cap mines here in the Black Hills of South Dakota. Occurs as “a secondary mineral in complex zoned granite pegmatites” and can be a product of hydrothermally altered triphylite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/whitmoreite.pdf

Formula
Fe2+Fe3+2(PO4)2(OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Aggregates 
Cleavage
Good, None, None 
Luster
Vitreous - Adamantine 
Color
brown, greenish brown, light yellow brown, dark brown 
Class
Monoclinic - Prismatic 
Hardness
WebMineral
View Whitmoreite 
Mindat
View Whitmoreite 

Whitmoreite from Big Chief mine, Pennington Co., South Dakota, United States

Whitmoreite
            from Big Chief mine, Pennington Co., South Dakota, United States

This is a superb specemin loaded with what Willad oberts coined "floating naval mines," which is how he described the crystals of this mineral. The crystals are acicular and root beer colored, protruding from a brown spheroidal center. These crystals reach maybe 0.75 to 1mm in size and are free-standing in vuggy Siderite matrix altered from Ludlamite in phosphate nodules.

Click thumbnail images for larger view.

Whitmoreite from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Whitmoreite
            from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Hagendorf was a huge zoned granitic pegmatite which produced a million tons of feldspar. This specimen is just one of numerous secondary phosphates which were found at Hagendorf. This specimen contains abundant little sprays of Whitmoreite, a mineral once described by Willard Roberts as "floating naval bombs" - (balls with spikes) in reference to the crystals found at the Big Chief mine in South Dakota. This habit holds true for most occurences.

Click thumbnail images for larger view.

Whitmoreite from Gravel Hill mine, Perranzabuloe, Cornwall, England

Whitmoreite
            from Gravel Hill mine, Perranzabuloe, Cornwall, England

Beautiful, superb sprays of rare Whitmoreite as single groups tp 0.75mm. This is the best Whitmoreite I have ever seen from any locality. Strunzite is shown in the last photo.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2021 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map