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LvMS-Lvm

Photomicrograph of a volcanic sand grain; upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box at left-center is 0.25 millimeter.


español: :Arena, conjunto de partículas de rocas disgregadas.


English: :Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. As the term is used by geologists, sand particles range in diameter from 0.0625 (or 1⁄16 mm, or 62.5 micrometers) to 2 millimeters. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles smaller than 0.0625 mm down to 0.004 mm in diameter. The next larger size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see particle size for standards in use). Sand feels gritty when rubbed between the fingers (silt, by comparison, feels like flour).[1]
Basic Quartz frit:
  1. Fine Sand 85 parts
  2. Soda Ash 15 parts
  3. Black Copper Oxide 1-6 parts





Books-aj.svg aj ashton 01f Referencias[]

  1. Fuente: Véase Sand en Wikipedia.
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