The analysis revealed that the sand is composed of quartz (67%), calcite (24%), dolomite (6%) and some amount of hendenbergite (3%), while the clay consists mainly of kaolinite (80%) and some quantity of muscovite (20%). Figure 1 shows the XRD patterns of the sample K30S70. The patterns show that quartz is the dominant
The pore percent of Sample 6 is 1.14% (tight carbonate) and is slightly higher compared to Sample 5. Dolomite content in Sample 6 is higher than in Sample 5, which is known for higher secondary porosity. Samples 7 and 8 are clay-rich samples and primarily contain kaolinite, illite, illite/smectite mixed-layer, and chlorite along with quartz ...
Two types of marbles, that is, calcite-dolomite marble and quartz-bearing calcite-dolomite marble were selected. Petrographic and scanning electron microscope analysis of dolomite samples indicated different grain sizes. X-ray diffraction technique indicated the calcites MgCO3 content up to 7.93 mol.%.
These are considered the most applicable to the 4 respective problem areas - the quantitative determination of calcite, dolomite, and quartz; the quantitative and the qualitative evaluation of the clay mineral fraction; and the composition of the carbonate minerals calcite and dolomite.
Introduction and methods applied: some new DTA-methods (quantitative determination of gypsum, determination of grain-size of carbonates, analysis of small amounts of iron in the dolomite lattice and of magnesium in calcite) and improved DTA-data on some minerals (clay minerals, Fe- and Al-hydroxides, pyrite, quartz, fluorite), occuring in the residue of carbonate rocks and not admitting ...
(quartz), if a limestone, the matrix density is 2.71 gm/cc (calcite); if a dolomite, then the matrix density is about 2.87gm/cc. The density log is scaled as bulk density in grams per cubic centimeter. If a "density porosity log" is displayed, then it will be an apparent porosity keyed to a specific mineral, usually calcite, in
percentages, the percentage of quartz is constant in all the samples (2.5 % -30 % ), gypsum is sporadic and is linked to a secondary genesis. The more important variability is in the percentage of calcite (10 % ·4.5 %) and dolomite (0 % -.50 %): the former appears dominant at the bottom,
Ołdrzychowice dolomite is characterized by a significant content of dolomite and lesser contents of calcite and quartz. It was calculated that the raw material is characterized by 95% dolomite content [ 10 ], which proves that the Ołdrzychowice dolomite is considered one of the purest varieties of dolomite [ …
Based on the mineral composition obtained from X-ray diffraction (XRD) analysis, the mineral phases in the BSE image can be classified as calcite, dolomite, quartz, clay minerals, and pyrite by utilization of a grey level thresholding method. The corresponding EDX image was used to verify the classification.
NIR spectrometers such as uniSPEC2.2HSI can identify similarly coloured limestone or clay minerals in quartz due to the chemical and mineralogical differences. The application idQuartz was developed for the NIR hyperspectral camera uniSPEC2.2HSI, enabling the identification of calcite and clay mineral impurities in quartz for sorting ...
X-ray diffraction patterns of the pure calcite and dolomite standards used in this study. d-Spacings for the calcite, dolomite, Mg- as nodules and cements, though it is not particularly abundant calcite, quartz, and zircon peaks are given by Brown and Brindley (Demko et al., 2004; Hasiotis, 2004).
A similar conclusion was reached by Nelson (1985) but, in addition to quartz, he considers feldspar and dolomite to be brittle constituents of the black shale units. The most variable mineral constituents in the Antrim Shale samples collected at the Paxton quarry are quartz, clay, carbonate, and organic matter (Richards, Walter, and others, 1994).
The MgCO3-content of the Mg-calcite and the com-position of the dolomite were determined by the shift of the (104) peak of calcite and of dolomite, respec-tively (Goldsmith and Graf, 1958; Fücht and Goldschmidt, 1965) using the position of the (101) peak of quartz as an internal standard. Many samples contain both stoichiometric dolomite ...
Semi-quantitative determination of bulk mineralogy composition (Quartz, Feldspar, Calcite, Dolomite, Evaporite Minerals) and clay content. Determination of clay mineral types in the clay fraction (e.g. illite/smectite, chlorite/smectite, kaolinite/smectite). This information is important for the petrophysical interpretation of wireline logs ...
The extremely high calcite content of sample 5 suggests temper addition, as is evidenced by the association of dolomite and the very low abundance of phyllosilicate (cf. Table 2). This clay is rich in calcite and poor in quartz and clay minerals, making it difficult to use in ceramic production.
According to several reports 18,22,29, quartz, clays (i.e., kaolinite, illite and montmorillonite), carbonates (i.e., calcite and dolomite,) and feldspars (i.e., albite and …
These include quartz, dolomite, magnesite, calcite, chlorite, serpentine and amphibole. Both serpentine and amphibole may occur in an asbestiform habit and we have developed a method based on an added internal standard to determine precise lower limits of detection in samples of talc …
contains quartz, feldspar, mica, and a few other minerals; most limestones consist of calcite, dolomite, and minor amounts of quartz, feldspar, and clay. Weathering and erosion of rocks produce particles of stone, gravel, sand, silt, and clay. Recycled concrete, or crushed waste concrete, is a feasible source of aggregates and an economic reality,
The Culebra Dolomite member of the Rustler Formation is mineralogically and texturally heterogeneous, both vertically and horizontally. Although the predominant mineral is dolomite, important constituents of the formation are clay, quartz, gypsum, and calcite.
Mineralogical transformations during firing of two extremely calcareous clays, one calcite and other dolomite rich, and relatively poor in silica were studied. Original clays were mineralogical and chemically characterized with X-ray diffraction
Analytica Chimica Acta, 286 (1994) 75-80 Elsevier Science B.V., Amsterdam 75 Quantitative determination of quartz in calcite, dolomite, and talc by powder x-ray diffraction analysis Gary P. Tomaino Specialty Minerals Inc., Ø0 North 13th Street, Easton, PA 18042 (USA) (Received 31st July 1992; revised manuscript received 9th February 1993) Abstract A detection limit of 0.05% quartz …
u.s. department of the interior u.s. geological survey abundances of major elements and sedimentary components in cuttings from the foxen, sisquoc, monterey, and point sal
Dolomite or dolostone is a carbonate sedimentary rock containing more than 50% by weight of the mineral dolomite.Dolomite rock may contain calcite, but the content of calcite should not exceed 10% of the calcite-dolomite pair's content 3.. Dolomite in Northern Norway (Trollholmsund) which was once chalk, but the original material has been replaced with dolomite.
This dolomite-gypsum sequence is represented by a dolomite sample (Cao 55Mg0 45C03) w*tn traces of calcite in the clay frac tion. The insoluble residues (<5%) consist of palygorskite, se-piolite, and quartz. DISCUSSION Carbonates The most important constituent in carbonates is low-Mg cal cite (<4% MgC03), comprising the coccoliths and ...
Cockeysville Marble. In Delaware, predominantly a pure, coarsely crystalline, blue-white dolomite marble interlayered with calc-schist. Major minerals in the marble include calcite and dolomite with phlogopite, diopside, olivine, and graphite. Major minerals in the calc-schist are calcite with phlogopite, microcline, diopside, tremolite, quartz ...
devoid of primary sedimentary features. Insoluble content ranges from less than 1 to 50 percent. 3. Calcite and dolomite in discrete zones. Thin sections of banded or laminated rock types may show the boundaries that separate layers dominantly dolomite from those dominantly calcite. These boundaries may be gradational or abrupt in character.
Determination of Formation Time of Calcareous Cements in Marine Sandstone and Their Influence on Hydrocarbon Accumulation: A Case Study of the Carboniferous Donghe Sandstone in the Hadexun Oilfield, Tarim Basin ... Type and content (%) of minerals: Total content of clay minerals (%) Quartz: K-feldspar: Calcite: Pyrite: Dolomite: HD4:
Inorganic carbonate in soil occurs predominantly as the sparingly soluble alkaline-earth carbonates, calcite (CaCOs) and dolomite (CaMg(CO,),). Calcite is usually the dominant form in active pedogenic environments (Doner & Lynn, 1977; Nelson, 1982). There are only a few reported occurrences of aragonite (CaCOs) and vaterite (CaCOs) in soils. Sodium carbonate and magnesium carbonate and ...
Calcite is weakly represented in these carbonate rocks. The samples (DNK and DE61) in which the calcite content is significant, the main peak of the mineral clearly appears at 3.03 Å . Quartz and orthoclase (potassium feldspar) are silicate minerals, prevalent in these rocks. Quartz's main peak appears at 3.34 Å.
1. Scope. 1.1 This test method covers the determination of carbonate content of soils and soft rock which can be readily broken down by mechanical effort. It is a gasometric method that uses a simple portable apparatus. Results should be clearly stated as the calcite equivalent in percent because different carbonate species cover a wide range ...