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 Hurlbutite

Reset

Hurlbutite

Hurlbutite

Named to honor ProfessorCornelius Searle Hurlbut Jr., an American mineralogist at Harvard University in Massachusetts, USA. Hurlbutite is a rare mineral that occurs late-stage in granite pegmatites and can be found as an alteration product of beryl. Localities for Hurlbutite are in the United States including here in the Black Hills of South Dakota at the Tip Top mine, Finland, Sweden, the Czech Republic, Zimbabwe, and a couple others.

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

Formula
CaBe2P2O8 
Crystal System
Monoclinic 
Crystal Habit
Prismatic 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
colorless, greenish white, yellow 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
WebMineral
View Hurlbutite 
Mindat
View Hurlbutite 

Hurlbutite from Tip Top mine, Custer Co., South Dakota, United States

Hurlbutite
            from Tip Top mine, Custer Co., South Dakota, United States

Clear to murky beads of Hurlbutite, some with yellow centers on Beryl matrix, loaded with other rare phosphates including cottonball like tufts of white Englishite, pink laths of Montgomeryite to 1mm and pink to red Roscherite. 

Clear beads of Hurlbutite to about 0.3mm.

Click thumbnail images for larger view.

Hurlbutite from Viitaniemi pegmatite, Eräjärvi area, Orivesi, Etelä-Suomen Lääni, Finland

Hurlbutite
            from Viitaniemi pegmatite, Eräjärvi area, Orivesi, Etelä-Suomen Lääni, Finland

A great specimen with two very rare beryllium phosphates from a Lithium-Cesium-Tantalum type pegmatite, which has produced so far at least 109 species and 2 type locality minerals. The Hurlbutite is at the tip of the green arrow, while the Vayrynenite is at the blue arrow. Vayrynenite is a Mn-Be phosphate is found at fewer than 15 localities worldwide. All of these specimens in the daily five today were collected in 1978.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map