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marcasite [mineral]

marcasite [mineral] . A common metallic light yellow or grayish orthorhombic mineral: FeS2. It is dimorphous with pyrite and resembles it in appearance, but marcasite has a lower specific gravity, less chemical stability, and usually a paler color. Marcasite often occurs in sedimentary rocks (such as chalk) in the form of nodules or concretions with a radiating fibrous structure. Syn: white iron pyrites; iron pyrites; white pyrite; white pyrites; cockscomb pyrites; spear pyrites; lamellar pyrites.

#48: Innovative approaches to old challenges - three case studies in Conventionals

In this episode, host Andrew Geary speaks with Shauna Oppert, guest editor for January's The Leading Edge. January's special section highlights three case studies focusing on conventional systems. These case studies take place in three different regions of the world, with each challenge tackled using innovative approaches to reservoir characterization in complex geologic regions.

gum

gum . An organic, viscid juice extracted from, or exuded by, certain trees and plants. It hardens in the air and is soluble in water.

Seven New Awardees of the Celebrate 100 Grants

Mars on the Mall

With the start of 2019, AGU’s Centennial is now in full swing. And what better way to celebrate than by having you, our members, create and plan events across the globe. That is why I am so pleased to announce the next set of Celebrate 100 Grants that enable our members and partners to share the wonder and excitement of Earth and space science and how it benefits communities and society.

intergrade

intergrade . (a) A taxonomic class at the subgroup level of soil taxonomy having properties typical of the great group of which it is a member and that are characteristic of some class in a higher category (any order, suborder, or great group) and indicates a transition to that kind of soil. (b) A soil that is amember of one such subgroup. See also: extragrade.

intergrade

intergrade . (a) A taxonomic class at the subgroup level of soil taxonomy having properties typical of the great group of which it is a member and that are characteristic of some class in a higher category (any order, suborder, or great group) and indicates a transition to that kind of soil. (b) A soil that is amember of one such subgroup. See also: extragrade.

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