	*(2007, June) The Backbender's Gazette* Vol. 38 (6) Houston Gem & Mineral Society**	Journal (issue)
	striated horizontally. 6 "Drusy" Quartz, Missouri, USA Denise Bicknell Collection THE BACKBENDER'S GAZETTE...Herkimer and Montgomery Counties area of New York, USA. Austria, Switzerland, and Germany have produced...common from alpine San Bernardino County, California, USA Denise Bicknell collection localities. Amethyst is...at Amethyst Hill in the Central Hill Country of Texas (Raines and Smith). Smoky quartz is colored grey...creating the darker coloration. Pikes Peak in Colorado, USA is known for its Smokey Quartz, Microcline var.
	*Polk, Patti (2010) Collecting Rocks, Gems and Minerals: Identification, Values and Lapidary Uses* (1st ed.) Krause Publications.**	Book (edition)
	for lapidary use is called chalcedony (pronounced kal-sid-nee). Chalcedony is tougher than crystalline...structure and perpendicular fiber layering. Pure chalcedony is nearly colorless and translucent, but can...patterned when included with other minerals. When chalcedony has distinctive bands or patterns on a clear...translucent background it is known as agate. When chalcedony is so infiltrated with mineral impurities that...areas of chalcedony, areas with agate banding, and opaque jasper or chert sections. Chalcedony, agate,
	*Mustoe, George, Acosta, Marisa (2016) Origin of Petrified Wood Color. Geosciences, 6 (2) 25 doi:10.3390/geosciences6020025*	Journal (article/letter/editorial)
	98225, USA Department of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, USA; macosta@uoregon...colorant for bright green fossil wood from Arizona, USA and Zimbabwe, Africa. Complex color patterns result...Arizona, USA, and red and green wood from the Eocene Clarno Formation at Hampton Butte, Oregon, USA. Other...Other specimens came from Nevada and Oregon, USA, and Zimbabwe and Madagascar, Africa. 2. Metallic Elements...Silicified wood can be mineralized with opal, chalcedony, or microcrystalline quartz. In pure form, these
	*Palandri, James L., Reed, Mark H. (2001) Reconstruction of in situ composition of sedimentary formation waters. Geochimica et Cosmochimica Acta, 65 (11) 1741-1767 doi:10.1016/s0016-7037(01)00555-5*	Journal (article/letter/editorial)
	Copyright © 2001 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/01 $20.00 ⫹ .00 Pergamon...University of Oregon, Eugene, Oregon 97403-1272, USA (Received March 14, 2000; accepted in revised form...silicate (K-feldspar, muscovite) and quartz or chalcedony. pH, CO2, and organic acid anions can be reconstructed...selected as diagnostic of equilibrium (from qz, chalcedony, mus, paragonite, k-sp, alb, kaol, ca, and dol)...California, offshore Norway, the Texas Gulf Coast, and offshore Texas. The calculations suggest that in
	*Mustoe, George (2015) Late Tertiary Petrified Wood from Nevada, USA: Evidence of Multiple Silicification Pathways. Geosciences, 5 (4) 286-309 doi:10.3390/geosciences5040286*	Journal (article/letter/editorial)
	Article Late Tertiary Petrified Wood from Nevada, USA: Evidence of Multiple Silicification Pathways George...Western Washington University, Bellingham, WA 98225, USA; E-Mail: mustoeg@wwu.edu; Tel: +1-360-650-3582 Academic...hydrothermal precipitation may produce opal, chalcedony, and quartz as deposits within a single cavity...textures observed in some chalcedony wood specimens are evidence of opal→chalcedony transition. In Nevada...in open spaces, not from recrystallization of chalcedony. Opal-A has seldom been reported in fossil wood

	kinetics in nanocrystalline quartz (agate and chalcedony) T. MOXON1,* 1 2 AND M. A. CARPENTER2 55 Common...similar pattern is observed. K EY WORDS : agate, chalcedony, moganite, crystallite growth, XRD, Zener pinning...limestone hosts (e.g. Minnelusa Formation, South Dakota, USA, Clark, 2002), fossil wood (Daniels and Dayvault...temperatures over long intervals of geological time. Chalcedony is a group name for the compact varieties of...submicroscopic pores (Deer et al., 1992). Banded chalcedony is known as agate and both generally show a ﬁbrous
	Mahaffey, Nova, Finkelman, Robert B. (2022) The Extraordinary Variety and Complexity of Minerals in a Single Keokuk Geode from the Lower Warsaw Formation, Hamilton, Illinois, USA. Minerals, 12 (7) 914 doi:10.3390/min12070914	Journal (article/letter/editorial)
	Illinois, USA Nova Mahaffey * and Robert B. Finkelman Department of Geoscience, University of Texas at Dallas...Dallas, Richardson, TX 75093, USA; bobf@utdallas.edu * Correspondence: novamahaffey5@gmail.com Citation:...grains containing gold and silver within the chalcedony shell. The presence of these potentially economically...association; scanning electron microscopy Illinois, USA. Minerals 2022, 12, 914. https://doi.org/10.3390/min12070914...guide to kaolinite geodes in Hamilton, Illinois, USA” [3]. Figure 1. Keokuk geode region and collection
	*(2004, December) Mineral News* Vol. 20 (12) Excalibur Mineral Corp.**	Journal (issue)
	(Continues on page 2) Heulandite, Apophyllite and Chalcedony Pseudoinorphs after Pectolite Bradley D. Plotldn...and I respect his integrity - of synthetic blue chalcedony! He presented it as a synthetic material and...relatively expensive, more so than equivalent natural chalcedony, but it is worth noting that people will try...Paterson area is This is entirely replaced by chalcedony. The piece is 3cm x 5cm apophyllite after pectolite...radiating texture of as one would expect for chalcedony. former pectol i te. All of the described pseudomorphs
	*(1997, December) Mineral News* Vol. 13 (12) L.R. Ream Publishing**	Journal (issue)
	News, P.O. Box 2043, Coeur d'Alene, ID 83816-2043 USA Phone: 208-664-2448 • 3 E-mail: lream@comtch.iea...fracture-filling minerals that include calcite, chalcedony, and crystallized quartz. Since I hadn't associated...I've ever done! In contrast to the calcite and chalcedony, quartz is generally poorly attached to its ironstone...(at lower right) in shrinkage cracks. Chalcedony -> Chalcedony Roses -> (locally common) (rare) -> "Pseudocubic"...siderite) which arc included for completeness. Chalcedony is the predominant quartz fracture fillino in
	Andrade, Carlos N., Chafetz, Henry S., Lapen, Thomas J. (2020) Paragenesis of silicified mid-Paleozoic and mid-Cenozoic corals based on petrography and silicon isotopic analyses. Chemical Geology, 538. 119483 doi:10.1016/j.chemgeo.2020.119483	Journal (article/letter/editorial)
	University of Houston, Houston, TX 77204-5007, USA A R T I C LE I N FO A B S T R A C T Editor: Michael...is later transformed to micromosaic quartz or chalcedony (Krauskopf, 1956; Lancelot, 1973; Knauth, 1979...megaquartz, in the case of both micromosaic or chalcedony precursors (Lancelot, 1973; Wise and Weaver,...at: 4800 Calhoun Rd., Rm. 327, Houston, TX 77004, USA. E-mail address: cmoreira@central.uh.edu (C.N. Andrade)...being most commonly replaced with botryoidal chalcedony and megaquartz (Weisbord, 1973). 2. Geologic
	*(2005, May) Mineral News* Vol. 21 (5) Excalibur Mineral Corp.**	Journal (issue)
	the Lower Cretaceous Rock Formations of Central Texas William L. Rader 8210 Bent Tree Road, #219 Austin...made in Lower Cretaceous rockfonnations of central Texas over the past few months. I. Quartz Mineralization...Katzenkopfen, Travis Peak Formation, Comal County, Texas In the February 2004 edition of Mineral News (Vol...documented a pair of localities in Comal County, Texas, where calcite geodes are weathering out of a bed...geode-bearing bed. The geodes at this locality contain chalcedony and quartz crystals along with calcite. Some
	Chen, Xinyang, Chafetz, Henry S., Andreasen, Rasmus, Lapen, Thomas J. (2016) Silicon isotope compositions of euhedral authigenic quartz crystals: Implications for abiotic fractionation at surface temperatures. Chemical Geology, 423. 61-73 doi:10.1016/j.chemgeo.2016.01.008	Journal (article/letter/editorial)
	Sciences, University of Houston, Houston, TX 77204, USA a r t i c l e i n f o Article history: Received...in the Cretaceous Edwards Formation from central Texas was petrographically analyzed and their Si isotopic...megaquartz, length-fast chalcedony, length-slow chalcedony, and zebraic chalcedony). Some of these silica...2003), whereas others have attributed zebraic chalcedony to the presence of sulfur in ⁎ Corresponding...Formation at Lake Georgetown Spillway, central Texas. The high spatial-resolution Si isotope data in
	*(1955) Classified Advertisements. Rocks & Minerals, 30 (9) 548-560 doi:10.1080/00357529.1955.11767876*	Journal (article/letter/editorial)
	R. V . Hollingsworth, Box 5 1 , M i d l a n d , Texas. W i l l exchange Florida minerals, western m i...gastropods, brachiopods, etc. Only $ 1 . 7 5 Postpaid USA. Robert Eaton, 5 4 Heberle Rd., Rochester, 9,New...2 " size, $ 1 . 5 0 lb. Slabs sent on approval. Texas light blue topaz, $ 1 per gram. B. & H Rock Shop...Shop, 2 0 0 5 N. Big Spring St., M i d l a n d , Texas. BLACK A N D GRAY LABRADORITES. Send 25c in coin...Helpenstell, 1 4 2 9 Sandpiper Drive, Bellaire, Texas. Iridescent sphalerite, J o p l i n , M o . , area
	*(1997, June) Mineral News* Vol. 13 (6) L.R. Ream Publishing**	Journal (issue)
	Pseudomorphs from Brazos County, Texas Art Smith 9118 Concho Houston, Texas 77036 Introduction Large silici...the BryanCol!~ge Stallon area of Brazos County, Texas. Thin, elongate cav111esparallel to the length of...of the log contain secondary bubbly chalcedony and quartz pseudomorphs after barite crystals. Originally...partly filled with a bubbly white to grayish chalcedony. The pseudomorphic crystals range in size from...petrified wood, Turkey Creek, Bryan, Brazos County, Texas, photograph by Art Smith. Mexico While the collectors
	*(1954) World News on Mineral Occurrences. Rocks & Minerals, 29 (9) 461-474 doi:10.1080/00357529.1954.11767076*	Journal (article/letter/editorial)
	James G. Manchester in your Dec. 1941 issue as chalcedony pseudomorph after coral are found here (in Hillsborough...with light gray chalcedony center; the other is the same but has a dark gray chalcedony. The specimens...appearance of snowballs spattered against the limestone. TEXAS — The following letter, dated June 24, 1954, comes... Ft Worth 4, Texas. "I am sending you some sand samples taken on a field trip the Texas Tech. Geology...Holiday. W e assembled at Van Horn (Culbertson Co.), Texas, where we saw a mica pegmatite at a place called
	Hofmann, B.A, Farmer, J.D (2000) Filamentous fabrics in low-temperature mineral assemblages: are they fossil biomarkers? Implications for the search for a subsurface fossil record on the early Earth and Mars. Planetary and Space Science, 48 (11) 1077-1086 doi:10.1016/s0032-0633(00)00081-7	Journal (article/letter/editorial)
	Research Center, MS-239-4, Mo ett Field, CA 94035-1000, USA Received 6 September 1999; accepted 15 November 1999...Arizona State University, Box 871404, Tempe, AZ 85287, USA. Farmer and Des Marais, 1999). Previous reports...microbial fossils include salt dome cap rocks in the Texas Gulf (Sassen et al., 1988) and mineral veins in...from this study: Firstly, minerals (dominantly chalcedony and zeolites) from low-temperature hydrothermally...hydrothermally altered volcanics, dominantly chalcedony and zeolites, and, secondly, samples from oxidized ore
	*Richard A. Jones, (1923) The Relation of the Reynosa Escarpment to the Oil and Gas Fields of Webb and Zapata Counties, Texas. AAPG Bulletin, 7. doi:10.1306/3d932642-16b1-11d7-8645000102c1865d*	Journal (article/letter/editorial)
	FIELDS OF WEBB AND ZAPATA COUNTIES, TEXAS 1 RICHARD A. JONES Laredo, Texas The oil and gas Fields of Webb...Webb and Zapata counties, Texas, have reached a stage of development that has brought to them the full attention...part of southwestern Texas. STRATIGRAPHY In the Coastal Plain of southwestern Texas, rocks of Eocene, Miocene...the Geology of Texas," Bull. 44, Univ. of Texas, re; 1 (>; "The Geology of East Texas," by E. T. Dumble...Dumble, Bull. 1S60, Univ. of Texas, ior8; "Ground Water in Lasalleand McMullen Counties," by Alexander Deusscn
	*Singleton, Scott (2008) Polygonal Fracturing in South Texas Petrifield Wood. Rocks & Minerals, 83 (2) 162-165 doi:10.3200/rmin.83.2.162-165*	Journal (article/letter/editorial)
	Live Oak counties and surrounding areas in South Texas (fig. 2) are popular petrified-wood hunting grounds...behind. SCOTT SINGLETON 3631 Grennoch Lane. Houston, Texas 77025 fossilwood@comcast.net 162 Unless otherwise...Johnny French specimen. Figure 2 (below). South Texas county map showing approximate area containing fractured...been collecting and studying fossil woods on the Texas Gulf Coast for about ten years. somewhat similar...golden-colored silica material, chalcedony. (Agates from this part of Texas have a characteristic dendritic
	(2004) Early dolomitization and fluid migration through the Lower Carboniferous carbonate platform in the SE Irish Midlands: implications for reservoir attributes, in Geometry and Petrogenesis of Dolomite Hydrocarbon Reservoirs. Special Publication, 235 (1) Geological Society of London. 367-392 doi:10.1144/gsl.sp.2004.235.01.16	Report (chapter)
	1325 S. Dairy Ashford Road, Houston, TX 77077, USA (e-mail."znagy@houston.oilfield.slb.com) 2Department... University of Missouri-Rolla, Rolla, MO 65401, USA 3Department of Geological Sciences, University of...of Missouri- Columbia, Columbia, MO 65211, USA 4Department of Geology, University College Dublin, Belfield...widespread occurrence of skeletal material replaced by chalcedony in open-marine wackestones and grainstones further...Irish Midlands. LSC, length-slow chalcedony; LFC, length-fast chalcedony; BCC, blocky calcite cement. GSI-89-10
	*Jacobson, Mark Ivan (2016) U.S. State Gemstones That Are Blue. Rocks & Minerals, 91 (1) 36-47 doi:10.1080/00357529.2016.1099132*	Journal (article/letter/editorial)
	state, the state legislature designated “the chalcedony stone, known as blue agate” as the state gemstone...1967 (2009 Nebraska Code, Chapter 90-108). Blue chalcedony was a good choice for a state that contains only...than Pennsylvanian. The state gemstone forms chalcedony masses with a gray to tan, plumed or banded exterior...blue to grayblue homogeneous interior. The blue chalcedony can be found in northwestern Nebraska, Dawes...state gemstone. TEXAS: Blue Topaz Blue topaz became the official state gem of Texas when Gov. Preston
	Hopkinson, Laurence, Roberts, Stephen, Herrington, Richard, Wilkinson, Jamie (1999) The nature of crystalline silica from the TAG submarine hydrothermal mound, 26°N Mid Atlantic Ridge. Contributions to Mineralogy and Petrology, 137 (4) 342-350 doi:10.1007/s004100050554	Journal (article/letter/editorial)
	silici®ed wall rock breccias (n 5). Length-fast chalcedony occurs in association with variable quantities...and 5 from below the anhydrite zone contain no chalcedony. Instead they contain subhedral quartz crystals...environments within the mound interior. Length-fast chalcedony occurs in an outer low temperature envelope across...between length-fast chalcedony and ferric iron oxyhydroxides suggests that chalcedony crystallization is...signi®cant amounts of microcrystalline silica, such as chalcedony (Humphris et al. 1995) and opal (Fouquet et al
	*(2023) Mourite. Handbook of Mineralogy. Mineralogical Society of America*	Report (issue)
	sandstone-hosted uranium deposit (Boso-Hackney prospect, Texas, USA). Association: Uraninite, molybdenite, jordisite...pyrite, marcasite, “opal,” chalcedony (Boso-Hackney prospect, Texas, USA). Distribution: From the Kyzylsai...about 19 km southwest of Falls City, Karnes Co., Texas, USA. Name: For MOlybdenum and URanium in the composition...National Museum of Natural History, Washington, D.C., USA, 127972. References: (1) Kopchenova, E.V., K.V. Skvortsova...(1971) Comparison of mourite from Karnes County, Texas with mourite from the U.S.S.R. Amer. Mineral., 56
	*(1955) Classified Advertisements. Rocks & Minerals, 30 (1) 100-112 doi:10.1080/00357529.1955.11767786*	Journal (article/letter/editorial)
	R. V . Hollingsworth, Box 5 1 , M i d l a n d , Texas. EXCHANGE: Dealers! I have calcite xls, carnotite...gastropods, brachiopods, etc. Only $ 1 . 7 5 Postpaid USA. Robert Eaton, 5 4 Heberle Rd., Rochester, 9,New...York. ROCKS AND MINERALS FOSSILS 15 CLASSIFIED TEXAS FOSSILS — $ 1 . 5 0 , plus postage. 2 0 classified...Jade excellent for carvings, takes high polish. Texas Agate in uncut nodules. Above minerals $ 1 . 0 0...horns $ 3 . 5 0 . Pioneer M u s e u m , Burnet, Texas. P Y R I T I Z E D GASTROPODS (Elasmonenma) Carboniferous
	*Burt, Frederick A. (1929) Capsular silica. American Mineralogist, 14 (6) 222-226*	Journal (article/letter/editorial)
	CAPSULAR SILICA FnBoBnlcr A. Bunr, A. &. M. Collegeof Texas. OccunnBNcB Three specimens of capsular silica have...from the Quaternary formations of Brazos County, Texas. Clastic fragments of petrified wood are very common...these formations, and much opal and botryoidal chalcedony is found as veins and incrustations with the...in precipitated silica which occurs as quartz, chalcedony, and opal. These three minerals are found in...composed of quartz intermingtea with finely fibrous chalcedony. Inclusions of limonite are fairly common, especially
	*MacFall, Russell P. (1951) Gem Hunter's Guide* (1st ed.) Thomas Y. Crowell Company, New York.**	Book (edition)
	collectors because a many material others of the Texas ranches are closed few carted away agate by the...phosphorescence under 2537 use. some from Miles, Texas, UV The radiation. to these sources natur-...contributes the Sweetwater moss agates, Specimen Hill chalcedony and Eden Valley petrified wood, which owe their...their reactivity to traces of uranium minerals. Texas supplies a calcite which is pink under long wave...yellow green — Aluminite: Saxony — — white Texas — — deep — — 3,650 — Bohemia — — wave; Quebec— —

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Chalcedony from Texas, USA

Chalcedony from
Texas, USA