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Excalibur Mineral Corporation

World leaders in providing rare minerals, analytical services and collector supplies to researchers, museums and private collectors since 1974. A comprehensive inventory of rare minerals (numbering over 200,000 specimens) is on hand, as well as aesthetic specimens shown in the photo gallery section. Geiger counters, UV lamps, microscopes and collector supplies are also stocked.

The Diamond Crystal Site for Excalibur

If you are interested in rough diamond crystals, this is the site for you! From an old and deep diamond inventory that encompasses numerous countries and localities, we offer the most entensive, locality-specific collection available in today's specimen market!

The Hudson Institute of Mineralogy

The Hudson Institute of Mineralogy is dedicated to the discovery, study and preservation of rare mineral species, and to increasing public awareness and appreciation of the mineral kingdom through outreach and education.  The Institute is a not-for-profit research, cultural and educational entity chartered by the Board of Regents of the University of the State of New York. In addition to its not-for-profit status, the Institute has applied to the Internal Revenue Service as a tax-exempt organization under section 501(c)(3) of the Internal Revue Code. As such, donations to the Institute are tax deductible to the fullest extent allowed by law.