Mineralpedia Details for 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
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.
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.