Search Mineralpedia – A Mineral Photo Database and Identification Guide
Named after Dr. Thomas Henry Holland, former Director of the Indian Geological Survey. An uncommon but widespread mineral found in localities in India, Sweden, Norway, Germany, Morocco, and the United States, and others. It can be found as a primary mineral in manganese ores that have been contact metamorphosed and as a secondary mineral as a weathering product of manganese bearing minerals.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hollandite.pdf
Named for Per Johan Holmquist, a Swedish petrologist. Holmquistite is a rare mineral that occurs as a metasomatic replacement near that outside of lithium-rich pegmatites. Localities fo Holmquistite are found in Sweden, Austria, the United States includeing here in the Black Hills of South Dakota in the Keystone area, Canada, Zimbabwe, South Africa, and Australia, among only a couple others. Minerals assocaited with Holmquistite include quartz, clinoholmquistite, tourmaline, spodumene, plagioclase, biotite, clinozoisite, and tourmaline.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/holmquistite.pdf
Named to honor Professor Arthur Pharoah Honess, a former American mineralogist at Pennsylvania State University in the United States. Honessite is a rare mineral that occurs in the USA, Greece, and Scotland as well as in newer localities in Russia, Germany, and Brazil. It can be found as an oxidation product of nickel sulfides. Assocaited minerals include millerite, violarite, bravoite, reevesite, hydohonessite, and theophrastite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/honessite.pdf
Named after Thomas Charles Hope who was the Professor of Chemistry at the University of Edinburgh in Scotland. Hopeite is a rare mineral that forms late-stage in hydrothermal zinc deposits and in complex granite pegmatites, and also occurs as incrustations on bone breccias in a limestone cave. Hopeite occurs in Belgium, Germany, Zambia, Canada, and the United States including here in the Black Hills of South Dakota in the Tip Top mine, among only a few others.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hopeite.pdf