bitter spar

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Related to ankerite: clinochlore, siderite
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Synonyms for bitter spar

a light colored mineral consisting of calcium magnesium carbonate

References in periodicals archive ?
It can be seen from XRD results, that (i) the dissolution of minerals (calcite and ankerite) and formation of bassanite and anhydrite in sulfuric acid and (ii) formation of sarcopside (metal phosphate) in phosphoric acid, contributed to the volume changes observed in kaolin clay due to acid contamination.
Croix River, is generally more thinly bedded (average 10-15 cm, ranging to 25 cm), more calcareous, contains more ankerite, and is finer grained than the western facies.
Caption: Figure 4: X-ray diffraction of coal gangue after [Na.sub.2]C[O.sub.3] activation and [H.sub.2]S[O.sub.4] wash and typical chemical formula of the mineral components: quartz (Si[O.sub.2]), kaolinite ([Al.sub.2][Si.sub.2][O.sub.5][(OH).sub.4]), albite (NaAl[Si.sub.3][O.sub.8]), nepheline (K[Na.sub.3][(AlSi[O.sub.4]).sub.4]), lime (CaO), sodium silicate ([Na.sub.2]O-nSi[O.sub.2]), illite (K[Al.sub.2] [(Al,Si)Si3[O.sub.10]]), ankerite (CaMg[(C[O.sub.3]).sub.2]), siderite (FeC[O.sub.3]), and gismondine (Ca([Al.sub.2][Si.sub.3][O.sub.10])3[H.sub.2]O).
Compared to sandstones present in the E6 structure, sandstones in the E7 structure in some parts of the Deimena Formation contain more clay and carbonate minerals, including ankerite, dolomite, admixture of feldspar and clay fraction represented by kaolinite and illite.
This particular pigment also contained a trace of ankerite, Ca([Mg.sub.0.67][Fe.sub.0.33])[(C[O.sub.3]).sub.2], along with gypsum CaS[O.sub.4].2[H.sub.2]O which was detected in several pigment samples as a minor component.
The XRD analysis of chromiferous iron ore occurrences was dominated by chlorite, illite, iron oxides, montmorillonite, and quartz, while ankerite and dolomite were detected in the marly formation samples.
(TSE:LEX)(FRA:VN3A)(OTCMKTS:LEXVF) announces that the technical report titled "TECHNICAL REPORT AND UPDATED RESOURCE ESTIMATE ON THE BUFFALO ANKERITE, FULLER, PAYMASTER, AND DAVIDSON TISDALE GOLD DEPOSITS - PORCUPINE MINING DIVISION, NORTH-EASTERN ONTARIO, CANADA NTS 42E 12/SW for Lexam VG Gold Inc, 181 Bay St, Suite 4750, Toronto, Ontario, M5J 2T3" dated June 21, 2013 (the "Technical Report") has been filed on SEDAR pursuant to the National Instrument 43-101 requirements.
As a result we may have been seeing the exposure of mineral veins, some of these quartz-ankerite associated with a distinct weathered copper mineralisation, such as the unique occurrence of weathered outcrops of quartz and ankerite vein.
Gold mineralization at the Gaffney Extension is hosted within a highly altered quartz eye intrusion which contains narrow quartz veins and stringers with disseminated pyrite and pervasive ankerite alteration.
The petrographic data (Tables 1 and 2) reveal the restored framework compositions, and in each case the way in which composition differs from the original framework is indicated: carbonate replacement of quartz (Cq); kaolinite, kaolinite plus illite, illite or carbonate replacement of K-feldspar (CaoK, Cik, Kill, Ck); illite replacement of albite (Ail); carbonate replacement of plagioclase (Cab); ankerite replacement of carbonate-rock fragments (Afrc).
Microscopically, its composition generally varies from 90 to 20% quartz, 2 to 65% muscovite, 5% opaque carbonaceous matter and up to 5% ankerite (Sutherland Brown 1957).