Rülein von Calw, U. (1983) Growth defects in a Quartz Druse. A local name for translucent wine and amethystine coloured chalcedony pebbles. A variety of Quartz from Tyrol, Austria, which contains yellow stains in cracks. Chalcedony containing dendritic inclusions. III: Silica Minerals. Knauth, L.P. (1994) Petrogenesis of chert. Phosphate fractionation in pegmatites of Pedra da Moura II claim–Ponte da Barca–Portugal. Mineralogical Magazine: 26: 172-178. Kihara, K. (1990) An X-ray study of the temperature dependence of the quartz structure. (1527) Querz. Crystal Research Technology: 19: 453-460. (1967) Transmission electron microscope study of Brazil twins and dislocations experimentally produced in natural quartz. Bernhardt, H.-J. I. Correlations between cathodoluminescence colors and paramagnetic defects. Caja de Ahorros del Mediterráneo. Series A, Mathematical and Physical Sciences: 231: 404-414. in: Heaney, P.J., Gibbs, G.V., editors. ; Mullis, J. Lang, A.R. Sedimentology: 34: 623-640. (2009) Minerali del marmo delle Alpi Apuane. Rivista Mineralogica Italiana, 38, 1 (1-2014), 36-41; Biagioni, C., Orlandi, P., Camarda, S., Chinellato, M., Appiani, R., Del Chiaro, L., and Sanguineti, G. (2019) Minerals from marbles of Carrara and the Apuan Alps. Chemical Geology: 84: 316-319. (1973) Transmission electron microscopy studies of plastically deformed quartz. VIII. Geochemical Journal: 48(2): 189-205. (1966) Color center in amethyst quartz. Baëta, R.D., Ashbee, K.H.G. Depending on the context, the term "chalcedony" has different meanings. American Mineralogist: 83: 2-22. Reviews in Mineralogy Volume 29 Silica - Physical behaviour, geochemistry and materials applications. (1975): Über die Mineralkluft im Amphibolit von Burgegg, Steiermark. McLaren, A.C., Pitkethly, D.R. Carpenter, M.A., Salje, E.K.H., Gaeme-Barber, A., Wruck, B., Dove, M.T., Knight, K.S. Scandale, E., Stasi, F. (1985) Growth defects in Quartz Druses. ac Dislocations. Perf. Quartz has great economic importance. (1988) Rapid subsidence and upthrusting in the Northern Apennines, deduced by fluid inclusion studies in quartz crystals from Poretta Terme. (1978): The vicissitudes of the low-quartz crystal setting or the pitfalls of enantiomorphism. Mineralogical Society of America, 123-176. Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Flick, H., Weissenbach, N. (1978) Magmatische Würfelquarze in Rhyolithen (Quarzkeratophyren) des Rheinischen Schiefergebirges. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Springer Verlag, Berlin, Heidelberg, 480pp. Januzzi, Ronald E. and David Seaman. Brady, P.V., Walther, J.V. Norsk Bergverksmuseum Skrift. Minerales y Minas de España. Proceedings of the National Academy of Science: 102: 15357-15362. Variety of jasper exhibiting pastel colors. Also single crystals that show a greater than 7 to 1 length to width ratio. Weber, Marcelle H. and Earle C. Sullivan. Dennen, W.H. Physica Status Solidi A: 34: 467-474. Proceedings of the Royal Society of London, Series A: 110(754) 443-455. Hoffmann, C.A.S. Gibbs, G.V., Downs, J.W., Boisen, M.B. (1913) Quartz fibreux. Memorie della R. Accademia delle Scienze dell'Istituto di Bologna, serie 2, 9, 56-60; Bombicci, L. (1874) Descrizione della mineralogia generale della provincia di Bologna. Götze, J. & 1:150,000 Geological and Mineral Localities Map of the Galway Bay Area. (2012) First-principles calculations of the E'. in Minerals in Soil Environments, Editor S.B. Memorie della R. Accademia delle Scienze dell'Istituto di Bologna, serie 5, 2, 747-761; Aloisi, P. (1909) Il quarzo dei marmi di Carrara. (1959) Directional grinding hardness of quartz by peripheral grinding. Verlag Wepf & Co. AG, Basel, page 209; Weiß, S., and Brack, P. (2018) Tessin. Geology: 16: 529-532. Calvo, M. (2016). Zeitschrift für Kristallographie: 163: 181-186. The Canadian Mineralogist: 29: 803-821. Skeletal quartz which has rhombohedral faces appearing like windows. American Mineralogist: 39: 886-900. The Mineralogical Press, Danbury, Connecticut. McLaren, A.C., Phakey, P.P. Proceedings of the Royal Society of London. Apparently the crystals were detrital, and got picked up b... A rounded quartz pebble representing a quartz crystal that has lost its brilliancy and angular form; in gravels, once believed to be a fabulous stone obtained from the head of a flying dragon. Weiss, C.S. Chakraborty, D., Lehmann, G. (1976) Distribution of OH in synthetic and natural quartz crystals. Langenhorst, F. (1994) Shock experiments on pre-heated α- and β-quartz: II. ; Spallanzani, L. (1784) Lettera seconda relativa a diversi oggetti fossili e montani al Sig. Quartz is found as individual crystals and as crystal aggregates. (2003) Laser Raman identification of silica phases comprising microtextural components of sinters.