Published in Lunar and Planetary Science XXVI, pp. 1183-1184, LPI, Houston. In transmitted light they have limpid, amber-colored cores and translucent to white mantles. In some cases, a thin black rim separates the core and mantle, while in others the mantle is sandwiched between two black rims. When thin sections are viewed under cathodoluminescence, the cores are nonluminescent and the mantles luminesce a uniform bright orange color.
Mantles are black and rims are bright white.
They are more complex in BSE but generally have cores that are lighter in contrast than the underlying substrate. Spheroid cores are uniform to slightly mottled, sometimes having very dark mantles. The mantles are noncontinuous and often border material that has been fractured from core interiors. Occasionally, the small spheroids have bright-white centers. Black irregular aggregates fill residual pore space and occur on some substrates that contain oblate spheroids.