Colorless+rock-crystal
21Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances …
22Quartz — Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in… …
23SiO2 — Quartz Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in… …
24Cristobalite — spheres formed via devitrification (loss of silica) from the obsidian matrix (California, USA) 5.9×3.8×3.8 cm. General Category Silicate mineral …
25quartz glass — noun colorless glass made of almost pure silica • Syn: ↑quartz, ↑vitreous silica, ↑lechatelierite, ↑crystal • Derivationally related forms: ↑crystallize (for: ↑crystal), ↑ …
26pebble — I. noun Etymology: Middle English pobble, from Old English papolstān, from papol (of unknown origin) + stān stone Date: 14th century 1. a small usually rounded stone especially when worn by the action of water 2. transparent and colorless quartz… …
27Abbas Ibn Firnas — (810 ndash; 887 A.D.) was also known as Abbas Qasim Ibn Firnas and العباس بن فرناس (Arabic language). He was born in Izn Rand Onda, al Andalus (today s Ronda, Spain), and lived in the Umayyad Caliphate of Córdoba in al Andalus. He was a Berber,… …
28quartz — A crystalline form of silicon dioxide used in chemical apparatus and in optical and electric instruments. * * * quartz kwȯ(ə)rts n a mineral SiO2 consisting of a silica that occurs in colorless and transparent or colored hexagonal crystals and… …
29pebble — peb·ble (pebґəl) colorless, transparent rock crystal from which lenses are sometimes cut …
30peb´ble|like´ — peb|ble «PEHB uhl», noun, verb, bled, bling. –n. 1. a small stone, usually worn smooth and rounded, especially by being rolled about by water or by glacial action: »to wake a person by throwing pebbles at his window. So wears the paving pebble in …
