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- Availability
- Available
- Price
- $125.00
- Reduced Price
- $60.00
- Locality
- Santa Cruz mine, Poopo dist., Oruro dept., Bolivia
- Formula
- FePb3Sn4Sb2S14
- Size
- 5 x 4.5 x 4 cm - Miniature
- Tagged
- sulfide, tin
Crystal cylinders or tubes of Cylindrite, an important ore of tin.
- Availability
- Sold
- Locality
- San José mine, Oruro City, Oruro Dept., Bolivia
- Formula
- Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14
- Size
- 4.5 x 4.5 x 4 cm - Miniature
- Tagged
- sulfide, tin
- Special Info
- EDS Confirmed
Excellent example of sulfide vein mineralization. In this case the sulfide is tin sulfide sandwiched between Pyrite and Quartz. The Franckeite crystals are platy and are generally between 1 to 3mm in size and some having striations. EDS.
- Availability
- Available
- Price
- $35.00
- Locality
- Pirquitas Ag-Sn Deposit, Rinconada Dept., Jujuy, Argentina
- Formula
- Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14
- Size
- 2.2 x 1 x 0.8 cm - Thumbnail
- Tagged
- sulfide, tin
Very fine granular Franckeite.
- Availability
- Sold
- Locality
- Pirquitas Ag-Sn Deposit, Rinconada Dept., Jujuy, Argentina
- Formula
- Ag2FeSnS4
- Size
- 3 x 1.5 x 1.5 cm - Thumbnail
- Tagged
- tin
Seriously hard-to-identify minerals. I am sure both minerals or in the matrix, since it was originally identified by Dr. Jaroslov Hrysl. In fact the Hocartite is visible on the specimen as spongy-looking dull black semi-spherical crystal groups to about 1mm and shown in the photos at the yellow arrows. At times, rocking the specimen back and forth a brassy color is seen. A good phot of Hocartite can be seen in Bernard and Hyrsl "Minerals and Their Localities on page 320. As far as the Pirquitasite goes, I just don't see it.
- Availability
- Sold
- Locality
- Brooks Mountain, Seward Peninsula, Alaska, United States
- Formula
- (Fe2+,Mg)2(Fe3+,Sn)O2(BO3)
- Size
- 2.1 x 1.3 x 0.5 cm - Thumbnail
- Tagged
- tin
- Special Info
- Type Locality
- Special Info
- XRD Confirmed
- Special Info
- EDS Confirmed
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.
- Availability
- Available
- Price
- $75.00
- Locality
- 10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico
- Formula
- Fe2+Sn4+(OH)6
- Size
- 4 x 2 x 3 cm - Miniature
- Tagged
- tin
A few distorted, bright orange, octahedral crystals less than 1mm on black Ilvaite with possible Helvine and colorless Fluorite.