Framboids / David Rickard.

Format:

Book

Author/Creator:

Rickard, David T. (David Terence), 1943- author.

Language:

English

Subjects (All):

Pyrites.

Ore deposits.

Sediments (Geology).

Texture (Crystallography).

Aggregation (Chemistry).

Genre:

Electronic books.

Physical Description:

1 online resource (xxv, 334 pages) : illustrations (some color)

Place of Publication:

New York, NY : Oxford University Press, [2021]

System Details:

text file

Summary:

"Framboids may be the most astonishing and abundant natural features you have never heard of. These microscopic spherules of golden pyrite consist of thousands of even smaller microcrystals often arranged in stunning geometric arrays. There are probably 1030 on Earth and they are forming at a rate of 1020 every second. This means that there are a billion times more framboids than sand grains on Earth and a million times more framboids than stars in the observable universe. They are all around us: they can be found in rocks of all ages and in present-day sediments, soils and natural waters. The sulfur in the pyrite is mainly produced by bacteria and many framboids contain organic matter. They are formed through burst nucleation of supersaturated solutions of iron and sulfide followed by limited crystal growth in diffusion-dominated stagnant sediments. The framboids self-assemble as surface free energy is minimized and the microcrystals are attracted to each other by surface forces. Self-organization occurs through entropy maximization and the microcrystals rotate into their final positions through Brownian motion. The final shape of the framboids is often actually polygonal or partially facetted rather than spherical, as icosahedral microcrystal packing develops. Their average diameter is around 6 microns and the average microcrystal size is about 0.1 microns. There is no significant change in these dimensions with time: the framboid is an exceptionally stable structure and the oldest may be 2.9 billion years old. This means that they provide samples of the chemistry of ancient environments"-- Provided by publisher.

Contents:

Framboid sizes

Framboid shapes

Microcrystal morphology

Framboid microarchitecture

The crystallography of pyrite framboids

Organic matter in framboids

Framboid mineralogy

Geochemistry of framboids

Pyrite framboid formation chemistry

Nucleation of framboids

Framboid microcrystal growth

Framboid self-assembly and self-organization.

Notes:

Includes bibliographical references and index.

Description based on online resource; title from digital title page (viewed on August 18, 2021).

Other Format:

Print version: Rickard, David T. (David Terence), 1943- Framboids

ISBN:

0197571921

9780190080129

0190080124

9780197571934

019757193X

9780197571927

OCLC:

1236900899

Access Restriction:

Restricted for use by site license.