Quartz pseudomorph after Calcite (ex Jack Halpern Collection) | Bor Pit (Boron Pit; Bor Quarry), Dal'negorsk B deposit, Dal'negorsk, Kavalerovo mining district, Primorskiy Kray, Far-Eastern Region, Russia
![Dolomite, Quartz - MD-270326 - Banska Stiavnica (Selmecbanya; Schemnitz) - Slovakia Mineral Specimen Dolomite, Quartz - MD-270326 - Banska Stiavnica (Selmecbanya; Schemnitz) - Slovakia Mineral Specimen](https://cdn.irocks.com/storage/media/32861/MD-270326a.jpg)
Dolomite, Quartz - MD-270326 - Banska Stiavnica (Selmecbanya; Schemnitz) - Slovakia Mineral Specimen
Datolite (rare blue color) (ex Kurt Hefendehl Collection) | Bor Pit, Dalnegorsk B deposit, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia
![Datolite (rare blue color) (ex Kurt Hefendehl Collection) | Bor Pit, Dalnegorsk B deposit, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia Datolite (rare blue color) (ex Kurt Hefendehl Collection) | Bor Pit, Dalnegorsk B deposit, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia](https://media.mineralauctions.com/380133/rlka29413a.jpg)
Datolite (rare blue color) (ex Kurt Hefendehl Collection) | Bor Pit, Dalnegorsk B deposit, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia
![Ulexite pseudomorph after Tincalconite after Borax (3 generations!) (ex Dr. Wouter van Tichelen Collection) | U.S. Borax Open Pit (Boron pit), U.S. Borax Mine, Kramer Borate deposit, Boron, Kern County California Ulexite pseudomorph after Tincalconite after Borax (3 generations!) (ex Dr. Wouter van Tichelen Collection) | U.S. Borax Open Pit (Boron pit), U.S. Borax Mine, Kramer Borate deposit, Boron, Kern County California](https://media.mineralauctions.com/316200/rlka25126a.jpg)