Signature Specimen: The Gabriel Copper At the A. E. Seaman Mineral Museum of Michigan Technological University
- August 1, 2024
- Jaszczak, John A.; Francis, Carl A.
- Rocks & Minerals
Maine Tourmaline Update
- January 1, 2025
- Francis, Carl A.; Felch, Myles M.
- Rocks & Minerals
Signature Specimen: Fluorite From the Erongo Mountains, Namibia, At the Perot Museum of Nature and Science, Dallas, Texas
- December 4, 2025
- Francis, Carl A.; Im, Caroline
- Rocks & Minerals
Connoisseur’s Choice: Brazil-Twinned Quartz, Pé da Serra Quartz Farm, Joaquim Felício, Minas Gerais, Brazil
- February 24, 2025
- Francis, Carl A.; Richards, R. Peter
- Rocks & Minerals
Six Ways to Recognize Dauphiné Twinning in Quartz
- April 1, 2025
- Francis, Carl A.; Richards, R. Peter
- Rocks & Minerals
Signature Specimen: Variscite, Little Green Monster Mine, Clay Canyon, Utah, at the Gillespie Museum (an Earth and Environmental Science Museum), Stetson University, DeLand, Florida
- April 15, 2025
- Francis, Carl A.; Mattson, Kristen Marshall
- Rocks & Minerals
Signature Specimen: Hemimorphite Pseudomorph after Calcite, Joplin Ore Fields, Missouri, at the Carnegie Museum of Natural History
- June 1, 2025
- Francis, Carl A.; Wilson, Debra L.; Olds, Travis A.
- Rocks & Minerals
Phoenix Collecting Couple: Willian H. Wilkinson and Pamela A. K. Wilkinson
- December 10, 2025
- Francis, Carl A.
- Rocks & Minerals
Aquamarine from Stoneham and Vicinity, Oxford County, Maine
- January 2, 2016
- Carl A. Francis; Myles Felch; Alexander U. Falster; Douglas A. Bailey
- Rocks & Minerals