Zircon external and internal morphology. Indexing after Caruba and Turco (1971) for prismatic (100 and 110) and pyramidal faces (211 and 101).
|Sample||Extracted zircon (μg/g)||Whole-rock Zr content (μg/g)||Zircon grains||Zircon sections|
|Vo14-16||159||153||Clear, euhedral, 100 < 110 et 211>101||Concentrically zoned in CL|
|Vo15-01||<607||315||Short, multi-facetted soccerballs, cracked by internal inflation; highly metamict, creamy pattern under direct light (binocular); almost opaque, dark brown in transmitted light||KF, biot, thorite, apatite inclusions, very dark in CL|
|Vo15-04||230||223||Pale pink and milky but transparent; often irregularly, step-facetted, or as easily broken arrowheads; looking corroded and/or fast crystallized||Dark in CL|
|Vo15-07||261||448||Mostly elongate needles, clear, euhedral, 100>110 up to 100 alone, 101>211 up to 101 alone||Dark in CL, biotite inclusions, axial (glassy?) inclusions in elongate sections|
|Vo15-08||191||131||Colourless, clear, many broken needles, plus shorter well-terminated euhedral grains, 100>110 and 101>211||Axial (glassy?) inclusions in elongate sections, concentrical zoning in CL for shorter sections|
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