Recently Released Special Editions
Tin Minerals
Introducing the "Tin Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including coiraite, ferronigerite-2n1s, franckeite, hocartite, and hulsite and more from places like Pirquitas Ag-Sn Deposit, Rinconada Dept., Jujuy, Argentina, Goltsovoe Li deposit, Irkutsk Oblast, Russia, Itos mine, near Oruro City, Oruro dept., Bolivia, San José mine, Oruro City, Oruro Dept., Bolivia, and Brooks Mountain, Seward Peninsula, Alaska, United States.
Ferronigerite-2N1s
- Sold
- Add to Favorites
- Locality
- Goltsovoe Li deposit, Irkutsk Oblast, Russia
- Formula
- (Al,Fe,Zn)2(Al,Sn)6O11(OH)
- Availability
- Sold
- Size
- 3.8 x 2.3 x 1 cm - Miniature
- Tagged
- tin
Two orange brown crystals to about 0.25mm in white muscovite schist.
Ferronigerite-2N1s
- Formula
- (Al,Fe,Zn)2(Al,Sn)6O11(OH)
- Crystal System
- Trigonal
- Crystal Habit
- Platy, Hexagonal, Anhedral Grains
- Cleavage
- None, None, None
- Luster
- Vitreous - Greasy
- Color
- colorless, amber yellow, golden brown, brown, red
- Streak
- grayish white
- Class
- Trigonal - Hexagonal Scalenohedral
- Fracture
- Brittle
- Hardness
- 8.5
- On Dakota Matrix
- Previously Sold Ferronigerite-2N1s
- On Dakota Matrix
- Other Available Ferronigerite-2N1s
- WebMineral
- View Ferronigerite-2N1s
- Mindat
- View Ferronigerite-2N1s
Hulsite
- Sold
- Add to Favorites
- Locality
- Brooks Mountain, Seward Peninsula, Alaska, United States
- Formula
- (Fe2+,Mg)2(Fe3+,Sn)O2(BO3)
- Availability
- Sold
- Size
- 3 x 1.4 x 0.8 cm - Thumbnail
- Special Info
- Type Locality
- Special Info
- XRD Confirmed
- Special Info
- EDS Confirmed
- Special Info
- Type Material
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.
Hulsite
- Formula
- (Fe2+,Mg)2(Fe3+,Sn)O2(BO3)
- Crystal System
- Monoclinic
- Crystal Habit
- Crystalline - Fine, Tabular
- Cleavage
- Good, None, None
- Luster
- Sub Metallic
- Color
- black
- Streak
- black
- Class
- Monoclinic - Prismatic
- Hardness
- 3
- Special Info
- Type Locality
- Special Info
- XRD Confirmed
- Special Info
- EDS Confirmed
- Special Info
- Type Material
- On Dakota Matrix
- Previously Sold Hulsite
- On Dakota Matrix
- Other Available Hulsite
- WebMineral
- View Hulsite
- Mindat
- View Hulsite
