Two green pargasite crystals in a marble matrix, one of which (pictured) overgrows a barely visible red spinel, really only visible under UV. Width of view 8.6mm. Stack of 25 images (white light), 20 images...
A sample of alluvial heavy concentrate in a vial from the Ringarooma River, Derby, containing mostly brown to black cassiterite, with minor orange zircons, and occasional sapphires and black spinel. Width of view 14.25mm. Stack...
A single blue octahedral spinel with minor matrix attached. Width 11mm. Stack of 140 images. Ex Ted Johnson. Collected in July 1987.
Black hexagonal hibonite with green spinel (out of focus top-middle) from Ambindandrakemba, Tranomaro Commune, Amboasary District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar.
Brown humite and pink spinel etched out of marble from Luc Yen, Yenbai Province (Yen Bai Province), Vietnam.
