Figure 2: Optical and electron probe micro-analyser images of silica clathrate minerals.
From: New silica clathrate minerals that are isostructural with natural gas hydrates
(a) Euhedral chibaite crystals. Scale bar, 2 mm. (b) Idealized crystal form of a single crystal. (c) Generally observed flattened form of a twinned crystal. (d) Photomicrograph of a thin section under a crossed polarized light. Scale bar, 0.2 mm. (e) Backscattered electron image (BSI) of the thin section. Scale bar, 0.2 mm. The DOH-type mineral is observed to be slightly darker than chibaite in the BSI image. The optical axis (c axis) of the DOH-type mineral is parallel to the <111> axis of chibaite. Ch: chibaite, D: the DOH-type silica clathrate mineral.
