Calcite
Calcite is a carbonate mineral and is among the most widely distributed minerals on the Earth's surface. Chemically, ... slaked lime (calcium hydroxide), and cement. It is used as a flux for smelting iron and steel, and (in pulverized form) as a soil conditioner.
Cements and cementation
Aragonite normally is dissolved in meteoric fluids; high-Mg calcite most commonly converts to low-Mg calcite during meteoric or burial diagenesis. Low-Mg …
Rheology of cement pastes with calcium carbonate …
Naturally occurring limestone currently used for concrete production mainly consists of calcite, and the other two metastable forms of anhydrous calcium carbonate include aragonite and vaterite. In this research, all three calcium carbonate polymorphs were synthesized in laboratory conditions and their effects on cement rheology were …
Calcite R050128
Kontak D J, Jackson S (1995) Laser-ablation ICP-MS micro-analysis of calcite cement from a Mississippi-Valley-type Zn-Pb deposit, Nova Scotia: dramatic variability in REE content on macro- and micro-scales, The Canadian Mineralogist, 33, 445-467
Materials | Free Full-Text | Calcium Carbonate …
A novel calcium carbonate cement system that mimics the naturally occurring mineralization process of carbon dioxide to biogenic or geologic calcium carbonate deposits was developed utilizing carbon …
Calcite Cement in Shallow Marine Sandstones: Growth …
Calcite cement in shallow marine sandstones normally cannot be derived from sources outside the sandstones owing to a lack of viable transport mechanisms for significant amounts of dissolved calcium carbonate.
14.7.1: Calcite Group Minerals
Calcite also occurs in some rare carbonate-rich igneous rocks and is a common cement in some sandstones. Calcite is an accessory mineral in rocks of many sorts. It is also a common weathering product. Organic calcite is found in shells and skeletal material. Figure 14.365: Iceland spar exhibiting double refraction. Varieties
Calcite, vaterite and aragonite forming on cement
Request PDF | Calcite, vaterite and aragonite forming on cement hydration from liquid and gaseous phase | Cement hydration products were studied as influenced by the hydration conditions ...
FROM CALCITE TO PORTLAND CEMENT
FROM CALCITE TO PORTLAND CEMENT Calcite [calcium carbonate, CaCO3] is a mineral that needs little introduction. It is the most abundant carbonate mineral and …
Calcite – Geology is the Way
Calcite is the main constituent of carbonate rocks and commonly occurs in the field as a component of limestones, marls, and fossils, but it can be found also in veins, as cement of other sedimentary rocks, as a mineral in igneous …
In-situ major and rare earth elements constraint on the …
This could most likely be explained by the possibility of two origins of calcite cement: (i) calcite cement precipitation from in-situ dissolution (Fig. 15 b1000); (ii) the dissolution of calcite cement in other parts diffusing into the current pores, and precipitating due to changes in diagenetic circumstance (Fig. 15 b0000). When the former ...
The Role of Calcium Carbonate in Cement Hydration
Request PDF | The Role of Calcium Carbonate in Cement Hydration | Limestone, mainly consisting of calcite, is a permitted additive to Portland cements often up to a 5 wt.% limit. It is shown by ...
Geochemical constraints on the origins of calcite cements …
The origins of calcite cements were constrained by geochemical and isotope measurements, fluid inclusion homogenization temperature, and in situ element analysis. The Ca-I calcite cement originated from dissolution of the lacustrine depositional carbonates in the interbedded mudstones and reprecipitation in the adjacent sandstones.
Origin of coarse-crystalline calcite cement in Early …
The calcite cement in the Lower Ordovician Majiagou Formation in the Ordos basin in northern China can be subdivided into three groups based on preliminary results of oxygen and carbon isotopes and fluid inclusion microthermometry.
The hydration, microstructure, and mechanical properties of …
Limestone (calcite) calcined clay cement (LC 3) is a promising low-CO 2 binder, but the low activity of calcite cannot compensate the reduction in clinker factor, resulting in low one-day strength and limiting its broad applications. As recent carbon capture and utilization technologies allow scalable production of vaterite, a more reactive …
Calcite, vaterite and aragonite forming on cement hydration …
Cement hydration products were studied as influenced by the hydration conditions (hydration time in liquid phase; relative humidity, RH, in gaseous phase). The formation of calcium hydroxide (portlandite, P) and its transformation to calcium carbonates is mainly discussed here. More hydration products, including P, were formed in liquid phase …
Insights into the growth morphology of calcite cement
The classic work on the morphology of limestone calcite cements done in the 1960s is extended here by utilising growth zones to reconstruct the growth of …
Cementation | Diagenesis, Lithification & Compaction
Cementation, in geology, hardening and welding of clastic sediments (those formed from preexisting rock fragments) by the precipitation of mineral matter in the pore spaces. It is …
Comparing the effects of in-situ nano-calcite
A comparison between the effects of in-situ formation and ex-situ addition of calcium carbonate nanoparticles (NPs) on cement hydration is herein inve…
Upper Ediacaran fibrous dolomite versus Ordovician fibrous calcite …
Fibrous carbonate cement is a common phase in marine phreatic environments — but its origin and diagenetic history are underexplored. This paper compares two fibrous fabrics that are different in terms of their peculiarities but share important similarities regarding their essentials: upper Ediacaran fibrous dolomite …
New constraints from in-situ U-Pb ages and fluid inclusions of calcite …
This paper presents in situ U–Pb ages, trace elements, and homogenized temperatures of fluid inclusion of calcite cement from fault damage zones in the northern Tarim Basin.
An investigation of the source of calcium carbonate from the …
It has been widely accepted that calcium hydroxide in cement paste is primarily transformed into the calcite phase during accelerated carbonation, and the initial phase of crystalline CaCO 3 from the carbonation …
(PDF) U-Pb dating of calcite cement and diagenetic history …
U-Pb dating of calcite cement and diagenetic history in microporous carbonate reservoirs: Case of the Urgonian Limestone, France
Sedimentary rock
Sedimentary rock - Limestones, Dolomites, Calcite: Limestones and dolomites are collectively referred to as carbonates because they consist predominantly of the carbonate minerals calcite (CaCO3) and dolomite (CaMg[CO3]2). Almost all dolomites are believed to be produced by recrystallization of preexisting limestones, although the …
[2401.11950] Calcite, vaterite and aragonite forming on cement …
Cement hydration products were studied as influenced by the hydration conditions (hydration time in liquid phase; relative humidity, RH, in gaseous phase). The formation of calcium hydroxide (portlandite, P) and its transformation to calcium carbonates is mainly discussed here.
Calcite
Overview of calcite mineral physical properties, structure and its origin and occurence in nature.
Diagenesis and origin of calcite cement in the Flemish Pass …
Petrographic characteristics and diagenesis evolution of Ti-3 sandstones. • Early formed calcite cement was sourced from the dissolution of biogenic marine carbonates in the modified seawaters evidenced by bulk geochemical data.
Calcite: Ultimate Guide (What It Is and Where To Find It)
Calcite is found in metamorphic, sedimentary, and igneous rocks around the world. In short, it's a mineral that's found everywhere you look. It's used in a wide range of applications that range from acid reduction, soil treatment, abrasive, pigment, pharmaceutical, and concrete.
Oscillatory zoning and trace element
After 3 months, calcite crystals were recovered from solution by placing the bottles in an ultrasonic bath for 15 min, and passing the solutions through a filter paper. Significant fine-grained calcite 'scale' remained inside the bottles. The growth of calcite in all solutions was confirmed by XRD analysis.
Transformation of mine tailings into cement-bound …
Transformation of mine tailings into cement-bound aggregates for use in concrete by granulation in a high intensity mixer. Author links open overlay panel Arne Peys a ... The quantitative phase composition in Table 4 shows that calcite, quartz and dolomite are the main phases present in the tailings. Feldspar minerals are found in …