twinning lamellae

См. также в других словарях:

• 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

• Microcline — Optical properties Microcline Microcline feldspar Crystal System: Triclinic Color in PPL …   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

• Amethyst — Infobox mineral name = Amethyst category = Mineral variety boxwidth = boxbgcolor = imagesize = caption = formula = Silica (silicon dioxide, SiO2) molweight = color = violet habit = 6 sided prism ending in 6 sided pyramid (typical) system =… …   Wikipedia

• Panethite — Infobox mineral name = Panethite category = Mineral Formula =(Na,Ca)2(Mg,Fe)2(PO4)2 color = Amber twinning = Simple twinning refractive = α=1.567, β=1.576, γ = 1.579 all + 0.001 opticalprop = Biaxial( ) birefringence = +0.009 (B G interval)… …   Wikipedia

• Orthoclase — General Category Silicate mineral Chemical formula KAlSi3O8 …   Wikipedia

• Paulingite — Infobox mineral name = Paulingite category = Zeolite Group boxwidth = boxbgcolor = imagesize = caption = formula = (K,Na,Ca)3 4(Si,Al)21O42 ·17 22H2O molweight = color = Colorless, light yellow, orange, red habit = typically as euhedral crystals… …   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

• 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

• Bournonite — is a sulfosalt mineral species, a sulfantimonite of lead and copper with the formula PbCuSbS3. It was first mentioned by Philip Rashleigh in 1797 as an ore of antimony, and was more completely described by the comte de Bournon in 1804, after whom …   Wikipedia

• Schreyerite — (V2Ti3O9), is a vanadium, titanium oxide found in the Lasamba Hill, Kwale district in Coast Province Kenya. It is a polymorph of kyzylkumite. The ore mineral occurs as exsolution lamellae and particles in rutile, coexisting with kyanite,… …   Wikipedia