Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 November 2023
American Mineralogist (2023) 108 (11): 1997–2003.
...William H. Peck; Dianne Keller; Victoria S. Arnold; Faith McDonald; Lily C. Kuentz; Paul M. Nugent Abstract Crushed ore in Adirondack wollastonite mines (New York) shows textural evidence for wollastonite dissolution and cementation by calcite and opal. The reaction CaSiO 3 + CO 2 = CaCO 3 + SiO 2...
FIGURES | View All (4)
Journal Article
Published: 03 July 2023
American Mineralogist (2023) 108 (7): 1275–1288.
... characteristics of (1) low-Cs-bearing ore (amorphous silica opal-A and opal-CT type) with low Cs (average of ~0.2 wt%), Na, K, Al, and Ca contents, and (2) high-Cs-bearing ore (clay type) with high-Cs (average of ~1.40 wt%), -Na, -K, -Al, and -Ca contents. It is reported for the first time that Cs primarily...
FIGURES | View All (8)
Journal Article
Journal: Geology
Published: 03 January 2023
Geology (2023) 51 (2): 189–192.
... of crystal growth within the gel. Over time, the gel hardened to form opal-A G . This silica phase is thermodynamically unstable and recrystallized to quartz that has a distinct mosaic texture. Mineral deposition in low-sulfidation epithermal gold deposits occurs in the shallow sub-surface, typically...
Journal Article
Journal: Geology
Published: 02 December 2022
Geology (2023) 51 (1): 85–90.
... interpreted to be caused by the conversion of opal-A to opal-CT ( Volpi et al., 2003 ). Figure 3. (A) Zoomed-in seismic section of slide 1. H—seismic horizon; SU—seismic unit. (B) Variance time slice calculated at ~130 ms twoway traveltime (TWT) below slide 1, revealing polygonal fault systems. (C...
FIGURES | View All (4)
Journal Article
Published: 21 November 2022
Mineralogical Magazine (2023) 87 (2): 186–193.
..., KZnCl 3 ⋅2H 2 O, halite, sylvite, opal and gypsum. Kalithallite forms lamellar to tabular crystals up to 5 × 30 × 40 μm combined in open-work aggregates up to 1 mm across. It is transparent, colourless in individuals and white to pale cream coloured or pale beige in aggregates, with vitreous lustre. D...
FIGURES | View All (4)