25 Investigates: A little-known mineral found in concrete is …
Pyrrhotite is a mineral that ended up in certain batches of concrete poured into foundations of homes. It is considered a geohazard in concrete because over time – typically 15 to 20 years - it begins to expand and break apart. So far, it has been detected in nearly 2,000 homes in central Massachusetts towns along the Connecticut border, as ...
A review of flotation and selective separation of pyrrhotite: A
The unit cell of monoclinic and hexagonal pyrrhotite are shown in Fig. 1 [1].Fe content of monoclinic pyrrhotite is between 46.5% and 46.8%, and that of hexagonal pyrrhotite is between 47.4% and 48.3% [41].The distance of Fe–S is in the range of 0.237–0.272 nm, and the average distance is 0.250 nm [28].As shown in Fig. 1, the …
Tous les mots contenant les lettres E, H, Q, 2R, S et U
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9.2.2: Sulfides and Sulfosalts
Pyrrhotite, seen in Figure 9.32, is the only one of the three that is magnetic, and sometimes that can distinguish it from the others. Some pyrrhotite has a more silvery color than pyrite which helps identification. Figure 9.31: Pyrite crystals from Huanzala, Peru Figure 9.32: Pyrrhotite from eastern Russia Figure 9.33: Tarnished chalcopyrite
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The Thermal Decomposition Behavior of Pyrite-Pyrrhotite
The main mineral components of the three samples were identified by XRD (Empyrean, PANalytical, Holland) at room temperature of 27°C. The results showed that FeS 2 was the main component in the pyrite, accompanied by a small amount of silica (SiO 2), and Fe 7 S 8 was the main component in the pyrrhotite, accompanied by a small …
Pyrrhotite
Pyrrhotite (Fe 1-x S) Pyrrhotite is the only IMA-approved Fe sulfide mineral found in the Lapanouse slags. It is especially frequent in the LdSV sample. Pyrrhotite analyses are reported in Table 13.2.30. The only evident difference between the LdS12 and LdSV pyrrhotites is the more frequent Ni enrichment of the latter.
25 Investigates: Tainted concrete aggregate may have been …
Concrete tainted with a little-known mineral called pyrrhotite is putting thousands of Massachusetts homes at risk, 25 Investigates reported on Tuesday. The primary source for that tainted material is believed to be a quarry in Willington, Connecticut. But as more Massachusetts homes - including a couple as far east as Holden and …
Atomic-Scale Characterization of Commensurate and Incommensurate
Pyrrhotite can be grouped into two categories, depending on the constituent superstructures: commensurate pyrrhotites with integer values of N and incommensurate (or intermediate) pyrrhotites with non-integer values. The chemical formulas of commensurate NC superstructures take the form Fe n–1 S n (n ≥ 8), where N = n/2 for n = even and N = …
Pyrrhotite Mineral Data
Name Pronunciation: Pyrrhotite + Pronunciation Synonym: Magnetic pyrites Pyrrhotite Image Images: Pyrrhotite Comments: Lustrous sharp crystals of pyrrhotite to 3.5 cm in …
In a state with crumbling home foundations, relief arrives
This pyrrhotite problem is the first of its kind in the United States. About 700 claims seeking assistance with foundation replacements have been filed so far this year, but Connecticut officials have said the problem could ultimately come in waves, affecting tens of thousands of homes in dozens of towns in the state and as far as southern ...
Tous les mots contenant les lettres H, Q, 2R, S et U
Liste des mots contenant les lettres suivantes H, Q, 2R, S et U. Il y a 125 mots contenant H, Q, 2R, S et U : AEROTHERMIQUES ANTIDIARRHEIQUES ARRHENOTOQUES ... TROPOSPHERIQUE TROPOSPHERIQUES XEROGRAPHIQUES. Tous les mots de ce site peuvent être utilisés au jeu de scrabble. Construisez également des listes de mots qui …
Tous les mots contenant les lettres H, Q, 2R et S
Liste des mots contenant les lettres suivantes H, Q, 2R et S. Il y a 125 mots contenant H, Q, 2R et S : AEROTHERMIQUES ANTIDIARRHEIQUES ARRHENOTOQUES ... TROPOSPHERIQUE TROPOSPHERIQUES XEROGRAPHIQUES. Tous les mots de ce site sont dans le dictionnaire officiel du scrabble (ODS). Construisez également des listes de …
Pyrrhotite Mineral Data
Physical Properties of Pyrrhotite : Cleavage: {0001} Imperfect, {1120} Imperfect : Color: Bronze, Bronze red, Dark brown. Density: 4.58 - 4.65, Average = 4.61 : Diaphaneity: Opaque : Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Habit: Massive - Granular - Common texture observed in granite and other igneous ...