Windows LockScreen

select language: DE-DE EN-US ES-ES FR-FR IT-IT JA-JP KO-KR PT-BR RU-RU ZH-CN AR-EG AR-SA DE-DE EN-AU EN-CA EN-GB EN-IN EN-NZ EN-US ES-AR ES-ES ES-MX FR-CA FR-FR ID-ID IT-IT JA-JP KO-KR PT-BR RU-RU TH-TH TR-TR VI-VN ZH ZH-CN ZH-HANS-CN ZH-HK ZH-TW

Black sand dunes washed by a cold blue sea, capped off by the flinty peaks of a mighty mountain?
In a land of incredible scenery, this still stands out

Golden beaches on tropical isles are lovely, but there's something to be said about black sand strands.
What makes these great grains?