Hulsite

Availability

Available

Price

$150.00

Size

2.1 x 1.3 x 0.5 cm - Thumbnail 

Formula

(Fe²⁺,Mg)₂(Fe³⁺,Sn)O₂(BO₃) (RRUFF)

Locality

Brooks Mountain, Seward Peninsula, Alaska, United States

Tagged

tin

Vitreous black, granular mass of rare Hulsite. Hulsite is formed by tin & boron-rich granitic intrusions in contact with limestone. The largest intrusive mass was the Brooks Mountain.

This specimen as well as the others, originated from the University of California, which was gifted the specimens by Adolf Knopf. Knopf and Schaller described the new mineral Hulsite in the American Journal of Science in 1908. Knopf collected the specimens in 1907, while investigating tin deposits in the Seward Peninsula of Alaska. You can see a copy of the original label in the prov. tab. Of special note Knopf explains on the label that this material was used by Yamnova, Simonov and Belov in 1975 for the structure determination of Hulsite. That makes these specimen type specimens from that study. Hulsite is rare and occurs in US in Alaska and maybe a dozen localities worldwide.

Type Locality, XRD Confirmed, EDS Confirmed