rhomb-shaped

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• Fresnel rhomb — A Fresnel rhomb is a prism like device designed in 1817 by Augustin Jean Fresnel for producing circularly polarized light. However, in contrast to a wave plate, the rhomb does not utilise birefringent properties of the material.The rhomb (usually …   Wikipedia

• Lozenge-shaped — Lozenged Loz enged (l[o^]z [e^]njd), Lozenge shaped Loz enge shaped ( sh[=a]pt), a. Having the form of a lozenge or rhomb. [1913 Webster] The lozenged panes of a very small latticed window. C. Bront[ e]. [1913 Webster] …   The Collaborative International Dictionary of English

• Porphyry (geology) — Porphyry is a variety of igneous rock consisting of large grained crystals, such as feldspar or quartz, dispersed in a fine grained feldspathic matrix or groundmass. The larger crystals are called phenocrysts. In its non geologic, traditional use …   Wikipedia

• Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… …   Wikipedia

• Latite — is an igneous, volcanic (extrusive) rock, with aphanitic aphyric to aphyric porphyritic texture. Its mineral assemblage is usually alkali feldspar and plagioclase (in a ratio < 1:4). Quartz is absent in a feldspathoid bearing latite, and olivine… …   Wikipedia

• Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… …   Wikipedia

• Crotalus basiliscus — Conservation status …   Wikipedia

• Nothofagus dombeyi — Conservation status Least Concern ( …   Wikipedia

• tectonic basins and rift valleys — ▪ landform Introduction       landforms characterized by relatively steep, mountainous sides and flat floors. The steep sides are created by displacement on faults such that the valley floor moves down relative to the surrounding margins, or,… …   Universalium

• Mount Kenya — Elevation 5,199 m (17,057 ft) …   Wikipedia

• diamond — I (New American Roget s College Thesaurus) n. gem[stone], jewel, sparkler, ice (sl.); engagement ring; parallelogram, lozenge, rhomb[oid], rhombus; check. See ornament, angularity, goodness. II (Roget s IV) n. 1. [A crystalline Jewel] Syn.… …   English dictionary for students