说明： arcosa.
1. f. Arenisca compuesta de granos de cuarzo mezclados con otros de feldespato. Es de textura variable y se emplea como piedra de construcción y para empedrados.
http://it.wikipedia.org/wiki/Arcosa http://en.wikipedia.org/wiki/Arkose
Arkose (IPA: /ˈɑː(r)kəʊz/) is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.[1],[2] Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose. The other mineral components may vary, but quartz is commonly dominant, and minor mica is often present. Apart from the mineral content, rock fragments may also be a significant component. Arkose usually contains small amounts of calcite cement, which causes it to effervesce slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide. Arkose is typically grey to reddish in colour. The sand grains making up an arkose may range from fine to very coarse, but tends toward the coarser end of the scale. Fossils are rare in arkose, due to the depositional processes that form it, although bedding is frequently visible.
-------------------------------------------------- Note added at 6 days (2007-05-22 11:09:55 GMT) Post-grading --------------------------------------------------
说明： arcosa.
1. f. Arenisca compuesta de granos de cuarzo mezclados con otros de feldespato. Es de textura variable y se emplea como piedra de construcción y para empedrados.
http://it.wikipedia.org/wiki/Arcosa http://en.wikipedia.org/wiki/Arkose
Arkose (IPA: /ˈɑː(r)kəʊz/) is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.[1],[2] Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose. The other mineral components may vary, but quartz is commonly dominant, and minor mica is often present. Apart from the mineral content, rock fragments may also be a significant component. Arkose usually contains small amounts of calcite cement, which causes it to effervesce slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide. Arkose is typically grey to reddish in colour. The sand grains making up an arkose may range from fine to very coarse, but tends toward the coarser end of the scale. Fossils are rare in arkose, due to the depositional processes that form it, although bedding is frequently visible.
-------------------------------------------------- Note added at 6 days (2007-05-22 11:09:55 GMT) Post-grading --------------------------------------------------
Thank you Paula.
Taña Dalglish 牙买加 Local time: 16:57 母语： English英语 此类别中专业问题的积分： 24
The translation workplace 
同仁同意（净值）： +4