vermiculite insulation is found in a building, evaluation for its potential asbestos content. traditionally involves collecting a sample from an attic or wall and …

Samples (plates) of vermiculite concentrate of various fractions were selected for investigation; this serves as a raw material for obtaining expanded …

One sample of expanded vermiculite ore from multiple sources was recognized as a limitation of the spectral method, therefore an additional test (i.e., 2.24-µm absorption position vs 2.24/2.38-µm band depth) was incorporated into the spectral method to eliminate misclassification caused by such mixtures. With portable field

Vermiculite is found in fine, rare, and somewhat larger sheets, and in other clay minerals with particles <4 μm. It is formed by weathering or hydrothermal alteration of biotite or phlogopite. Vermiculite is an essential ingredient of soil and clay sediments. The mineral can be transformed, easily and quickly, into smectite in surface weathering.

Both vermiculite ore from Libby and the manufactured product Zonolite are known to contain a significant quantity of amphibole asbestos. Records show that up to 10,317 tons of vermiculite ore were processed at the Site from January 1967 to October 1970. ... All samples contained from trace amounts to 2% total asbestos fibers. In 2001 the START ...

Writers are taken that the vermiculite ore deposit exists in the alkali-ultrabasic complex in Yuli Xinjiang as the example, contrast it with same deposits at home and abroad, and find its inhere law and establish the metallogenic model. Proceed to the next step, these studies have profound theoretical significance and fremendous economic significance to find and …

27 Vermiculite. Vermiculite is a term applied commercially to micaceous minerals (essentially hydrated silicates of Al, Mg and Fe), usually alteration products of biotite or …

Vermiculite (Mg; Fe3+; Al)3(Si; Al)4O10(OH)224H2O. Crystal Data: Monoclinic. Point Group: 2=m: As large crystalline plates, which may have a pseudohexagonal outline; in …

Figure A10. Evaluation of the total surface area of an expanded vermiculite ore sample that must be spectrally measured to derive a precise average 1.38/2.32-μm band-depth-ratio value for source determination.

Quantitative XRD diffractograms are included for an ore sample from each of the four major historical vermiculite sources. Scanning Electron micrographs of the …

Fiber-like structures can be seen along the left edge of the piece of ore on the left. An official website of the United States government. Here's how you know. ... Figure 2 Photograph of a sample of Libby, Montana, vermiculite ore. Fiber-like structures can be seen along the left edge of the piece of ore on the left.

One sample of expanded vermiculite ore from multiple sources was recognized as a limitation of the spectral method, therefore an additional test (i.e., 2.24-µm absorption position vs 2.24/2.38-µm band depth) was incorporated into the spectral method to eliminate misclassification caused by such mixtures. With portable field

Vermiculite other than that from Libby, Montana can contain amphibole with composition 93>consistent94> with 93>Libby amphibole.94> The amphibole bundle (Fig. GDS629.SEM.1) and other elongate amphibole particles may be associated with the Enoree component in this sample and are similar in appearance to those present in sample …

The sample has a spectral signature similar to that of expanded vermiculite ore from Libby, Montana, USA. Original spectrum published in: IMAGE_OF_SAMPLE: END_SAMPLE_DESCRIPTION. ... The spectrum is typical for a sample with predominately vermiculite and hydrobiotite with a trace biotite. The 1.40/1.42 micron band depth ratio …

PE Vermiculite = 4.01 barns/electron U=PE Vermiculite x rElectron Density= 10.06 barns/cc. Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units) Vermiculite is Not Radioactive : Vermiculite Classification: Dana Class: 71.02.02d.03 Phyllosilicate Sheets of Six-Membered ...

Data are provide for four samples of unexpanded vermiculite ore from mines near Enoree, South Carolina; Libby, Montana; Louisa, ia; Palabora, and South Africa. ASCII text files listings of Moss data for each sample are provided in comma-separated by value (csv) files. These files have the file naming structure …

2. Obtaining vermiculite small particles . Natural vermiculite flakes are characterized by high values of aspect ratio. In clay science, exfoliation involves a degree of separation of the layers of a host structure where units, either individual layers or stacking of several layers, are dispersed (freely oriented and independent) in a solvent or polymer …

COLLECTION_LOCALITY: This sample came from a bag of Schultz ™ horticultural vermiculite purchased locally in Denver in 2001. ORIGINAL_DONOR: CURRENT_SAMPLE_LOCATION: USGS Denver, CO ULTIMATE_SAMPLE_LOCATION: USGS Denver, CO SAMPLE_DESCRIPTION: The sample has a mottled golden color …

Unexpanded and expanded vermiculite ore samples from Montana, ia, and South Africa sources were analyzed using polarized light microscopy, x-ray …

Vermiculite is milled in the elongated particles of amphibole in the suspended same way a rock or ore sample is handled, followed fraction. The purpose of the analysis is to determine by PLM analysis using a point count procedure (53). if the amphiboles are consistent with Libby amphib- Gunter and Sanchez have determined the amount oles.

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All samples of vermiculite ore and exfoliated product did not show any asbestos (amphibole or chrysotile) at low (0.001% by TEM) detection levels. No amphibole asbestos or chrysotile fibers were detected in any of the samples analyzed by polarized light microscopy. Chrysotile was not detected in any of the bulk materials by X-ray …

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Vermiculite is a hydrated magnesium aluminum silicate mineral which resembles mica in appearance. It is found in various parts of the world including Australia, Brazil, Bulgaria, Kenya, Russia, South Africa, …

One sample of expanded vermiculite ore from multiple sources was recognized as a limitation of the spectral method, therefore an additional test (i.e., 2.24 μm absorption position vs. 2.24/2.38 μm band depth ratio) was incorporated into the spectral method to eliminate misclassification caused by such mixtures. With portable field ...

Vermiculite is produced from ore mined throughout the world. In the United States, mines are located in Montana, South Carolina, and ia. When heated, the ore expands into …

vermiculite, but rather mixed-layer mica-vermiculite struc-tures containing vermiculite and biotite (phlogopite) in vari-ous proportions [5]. Such a structure can be regular or irregu-lar, but in any case it affects the properties of vermiculite ore, in particular expansion. According to data obtained in numerous investigations, a

The conclusion: "The results of our analysis program confirm that the sample of crude vermiculite ore provided by American Vermiculite Corporation is composed of high grade vermiculite containing only minor traces of impurities. No asbestos was found during this intensive analysis program." Then in October, 1979, Palabora Mining Company had ...

One sample of expanded vermiculite ore from multiple sources was recognized as a limitation of the spectral method, therefore an additional test (i.e., 2.24-µm absorption position vs 2.24/2.38-µm band depth) was incorporated into the spectral method to eliminate misclassification caused by such mixtures. With portable field

Vermiculite is produced from ore mined throughout the world. In the United States, mines are located in Montana, South Carolina, and ia. When heated, the ore expands into a light, rather fluffy material, that is fire resistant, chemically inert, absorbent, light weight, and odorless. The absorbent properties of the ex-