Psammite

Psammite

:"This article is about a type of sedimentary rock. For the work by Archimedes, Psammites, see The Sand Reckoner.

Psammite (Greek "Psammos", Sand) is a general term for a sandstone, most often used to describe a metamorphosed rock unit with a dominantly sandstone protolith. An alternative term, more commonly used for "unmetamorphosed" sediments, is arenite (adj "arenaceous").Pettijohn [Pettijohn F.J. (1975), "Sedimentary Rocks", Harper & Row, ISBN 0-96-045191-2] gives the following descriptive terms based on grain size, avoiding the use of terms such as "clay" or "argillaceous" which carry an implication of chemical composition:

References


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  • psammite — [ psamit ] n. m. • 1807; du gr. psammos « sable » ♦ Minér. Grès argileux micacé. ● psammite nom masculin ou nom féminin Grès riche en micas d origine détritique. ⇒PSAMMITE, subst. masc. GÉOL., MINÉR. ,,Grès à ciment fréquemment argileux, riche en …   Encyclopédie Universelle

  • Psammite — Psam mite, n. [Gr. ? sandy, from ? sand: cf. F. psammite.] (Min.) A species of micaceous sandstone. {Psam*mit ic}, a. [1913 Webster] …   The Collaborative International Dictionary of English

  • Psammite — (Min.), so v.w. Grauwacke …   Pierer's Universal-Lexikon

  • psammite — [sam′īt΄] n. [Fr < Gr psammos, SAND + ite, ITE1] ARENITE psammitic [sa mit′ik] adj …   English World dictionary

  • Psammite — La psammite est une roche sédimentaire détritique, riche en quartz et en muscovite. Origine Lorsqu un massif granitique subit de l érosion, il se transforme en arénite. Certains minéraux de celle ci, lors du transport par l eau de la roche, vont… …   Wikipédia en Français

  • psammite — psam·mì·te s.f. TS petr. non com. → 1arenaria {{line}} {{/line}} DATA: 1823. ETIMO: dal gr. psammítes sabbioso , der. di psámmos sabbia , cfr. fr. psammite …   Dizionario italiano

  • psammite — psammitic /sa mit ik/, adj. /sam uyt/, n. Geol. any sandstone. Also called arenite. [1880 85; < Gk psámm(os) sand + ITE1] * * * …   Universalium

  • psammite — noun Any sandstone, but most often a metamorphosed rock unit with a dominantly sandstone protolith …   Wiktionary

  • psammite — (psa mmi t ) s. m. Terme de minéralogie. Roche appelée aussi grès des houillères. ÉTYMOLOGIE    Du grec, sable …   Dictionnaire de la Langue Française d'Émile Littré

  • psammite — pl.f. psammiti …   Dizionario dei sinonimi e contrari

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