Phase A
A material that is NOT an approved mineral species
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Formula:
Mg7Si2O8(OH)6
A dense hydrous magnesium slicate (DHMS) phase theoretically present under high P-T conditions in the earth's mantle or subducting crust. It can contain up to 12 wt% water and was first synthesized by Ringwood and Major (1967) and by Sclar et al (1967) at conditions ranging from 525 to 1100°C and 7.5 to 18 GPa. Its composition lies along the forsterite-brucite join (Yamamoto and Akimoto, 1974; Sanchez-Valle et al., 2006).
Interest in phase A is as a potential carrier of water into the transition zone. Substantial uncertainties persist in the determination of its equation of state and thermodynamic parameters such as compressibility (Sanchez-Valle et al., 2006).
Interest in phase A is as a potential carrier of water into the transition zone. Substantial uncertainties persist in the determination of its equation of state and thermodynamic parameters such as compressibility (Sanchez-Valle et al., 2006).
Unique Identifiers
Mindat ID:
29205
Long-form identifier:
mindat:1:1:29205:0
GUID
(UUID V4):
(UUID V4):
5c970f02-421e-4a3b-8539-2d5f85276fbe
Chemical Properties of Phase A
Formula:
Mg7Si2O8(OH)6
Elements listed:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Phase A
mindat.org URL:
https://www.mindat.org/min-29205.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Phase A
Reference List:
Localities for Phase A
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Kosovo | |
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Pacific Ocean | |
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Russia | |
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