Ice snow or glacial - Geophotography
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Rock or Glacial flour forming dunes

Rock or Glacial flour forming dunes

"Rock Flour - Finely comminuted, chemically unweathered material consisting of silt- and clay-sized angular particles of rock forming minerals, chiefly quartz, formed when rock fragments are pulverized while being transported or are crushed by the weight of superincumbent material. The term is most commonly applied to very fine powder when stones embedded in a glacier or ice sheet abrade the underlying rocks, and is deposited as the matrix in till or in outwash deposits" Glossary of Geology 5th Edition