“Cryolite occupying cavities in a quartz matrix, recognizable by its distinctive multi-layered appearance due to pseudo-cubic crystal parting, and surrounded by brown alteration rims composed of other secondary aluminofluorides with much smaller crystal sizes. Dan A. Polhemus photo, acquired using a Leica MC170 HD digital camera linked to a Leica M-165C computerized microscope, with photo compositing using Leica Application Suite 4.12.0 AutoMontage software, and post-processing using Photoshop 8.0. Self-collected; currently in the Polhemus collection, catalog # POL-MIN-2025-0127. ”

“Tabular cryolite in a quartz matrix. As noted by Cross & Hillebrand (1885): “…the three marked cleavage directions are situated nearly at right angles to each other” as is nicely illustrated in this specimen. Dan A. Polhemus photo, acquired using a Leica MC170 HD digital camera linked to a Leica M-165C computerized microscope, with photo compositing using Leica Application Suite 4.12.0 AutoMontage software, and post-processing using Photoshop 8.0. Self-collected; currently in the Polhemus collection, catalog # POL-MIN-2025-0127. Ref.: Cross, W. & Hillebrand, W. F. (1885) Mineral from the neighborhood of Pikes Peak. Bulletin of the U. S. Geological Survey, 20: 40-74. ”