- twinning albite
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двойниковый альбит
English-Russian dictionary of geology. 2011.
twinning albite
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Albite — is a plagioclase feldspar mineral. It is the sodium endmember of the plagioclase solid solution series. As such it represents a plagioclase with less than 10% anorthite content. The pure albite endmember has the formula NaAlSi3O8. It is a… … Wikipedia
Crystal twinning — Diagram of twinned crystals of Albite. On the more perfect cleavage, which is parallel to the basal plane (P), is a system of fine striations, parallel to the second cleavage (M). Crystal twinning occurs when two separate crystals share some of… … Wikipedia
feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… … Universalium
Microcline — Optical properties Microcline Microcline feldspar Crystal System: Triclinic Color in PPL … Wikipedia
Plagioclase — A photomicrograph of a plagioclase crystal under cross polarized light. The plagioclase crystal shows a distinct banding effect called a Polysynthetic twinning. (unknown scale) General Category … Wikipedia
plagioclase — plagioclastic /play jee euh klas tik/, adj. /play jee euh klays /, n. any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on… … Universalium
Orthoclase — General Category Silicate mineral Chemical formula KAlSi3O8 … Wikipedia
Pericline — also refers to a doubly plunging anticline or syncline. Pericline is a form of albite exhibiting elongate prismatic crystal. Pericline twinning is a type of crystal twinning which show fine parallel twin laminae typically found in the alkali… … Wikipedia
Cleusonite — General Category Oxide minerals Chemical formula (Pb,Sr)(U4+,U6+)(Fe2+,Zn)(Ti,Fe2+,Fe3+)18(O,OH)38 Strunz classification 0 … Wikipedia
Jadeite — This article is about the mineral. For other uses, see Jadeite (disambiguation). Jadeite Jadeite General Category … Wikipedia
Macle (cristallographie) — Pour les articles homonymes, voir Macle. Macle par pénétration de trois cristaux de pyrite Une macle est une association orientée de deux ou plusieurs cristaux identiques, di … Wikipédia en Français
