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Todorokite

(Na, Ca, K, Ba, Mn2+)2 Mn4O12•3H2) A black manganese oxide that occurs in soils and in the weathered regolith of sediments. It has a tunnel structure.

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todorokite
Earth science; Soil science

(Na, Ca, K, Ba, Mn2+)2 Mn4O12•3H2) A black manganese oxide that occurs in soils and in the weathered regolith of sediments. It has a tunnel structure.

todorokite
Mining; General mining; Mineral mining

A monoclinic mineral, (Na,Ca) 0.5 (Mn,Mg) 6 O 12 .4H 2 O ; forms black spongy banded and reniform aggregates composed of minute lathlike crystals; in Hokkaido, Japan.

todorokite
Geology; Mining; Minerals

Todorokite is a rare complex hydrous manganese oxide mineral with the formula (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O. It was named in 1934 for the type locality, the Todoroki ...

swamp
Earth science; Soil science

Swamp is an area which is flooded or drenched with water and related to plunge or cause to sink.

semiarid
Earth science; Soil science

Fairly dry because of low rainfall. Semiarid regions, such as a prairie, usually have enough water for grasses and some bushes to grow.

talus
Earth science; Soil science

A sloping pile of small pieces of rock that is at the base of a cliff is called talus.

silt
Earth science; Soil science

Small grains or particles of broken down rock. Silt particles are smaller than grains of sand but larger than the particles in clay.

talc
Earth science; Soil science

A very soft, white or green mineral found in igneous and metamorphic rocks is called talc.

stone
Earth science; Soil science

A general term for rock, especially as used in construction. A hard clump of minerals that forms in a part of body.

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