sanbornite


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sanbornite

[′san‚bȯr‚nīt]
(mineralogy)
BaSi2O5 A white triclinic mineral composed of barium silicate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The results revealed that the inorganic deposits part from suction strainer for pumps (XRPDB) consisted of carbonate scale in the form of calcium carbonate with the mineral name of calcite (CaC[O.sub.3]), formation sandstones in the form of silicon oxide with the mineral name quartz (Si[O.sub.2]), drilling muds in the form of barium sulfate with the mineral name of barite (BaS[O.sub.4]), and barium silicate (sanbornite (Ba[Si.sub.2][O.sub.5])).
The used standards for major, minor, and REE components were wollastonite (Si), anorthite (Al, Ca), omphacite (Na), olivine (Mg), K-feldspar (K), Zr-jarosite (Zr), ilmenite (Ti), Cr pure (Cr), rhodonite (Mn, Zn), fayalite (Fe), celestine (Sr), sanbornite (Ba), and F-apatite (F).
The Baumann prospect, once explored for its barite potential in the late 1920's, hosts a number of barium minerals including alforsite, barite, bazirite, benitoite, celsian, fresnoite, hyalophane, krauskopfite, macdonaldite, sanbornite, titantaramellite, walstromite, witherite and two new minerals which are currently under study.
Minerals listed by Alfors and Pabst (1984) from this prospect include sanbornite, fresnoite, krauskopfite, titantaramellite, barite, witherite and celsian.
These pods are conspicuous due to the alteration of the sanbornite surface to a white opaline material.
The sanbornite outcrops are entirely enclosed by quartzite, cover an area of about 1.5 x 10 meters, and show nearly vertical dip.
Occurrence: In fractures in gneissic rocks composed of sanbornite, quartz, diopside, pyrrhotite and barium-bearing minerals.
Relationship to other species: Its structure has similarities to those of sanbornite and gillespite.
Associated minerals are: sanbornite, gillespite, quartz, titantaramellite, anandite and kinoshitalite.
Trumbull Peak is one of several barium silicate occurrences located along the western margin of North America; it hosts such minerals as alforsite, celsian, gillespite, macdonaldite, pellyite, titantaramellite and witherite, and is the type locality for sanbornite. Additional minerals discovered during this study include benitoite, fresnoite, kinoshitalite, krauskopfite and walstromite.
The first description of the Trumbull Peak Ba-silicate locality was published by Rogers in 1932 when the new barium silicate sanbornite was described, in addition to new localities for celsian and gillespite.
Rogers performed an analysis of the mineral and determined it to be a new layered barium silicate; he named it sanbornite after Frank Sanborn, in recognition of his faithful work as a determinative mineralogist.