macdonaldite
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Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O. Macdonaldite was first described in 1965 and named for Gordon A. Macdonald (1911–1978) an American volcanologist at the University of Hawaii.
Key facts
- Mineral.name
- Macdonaldite
- Mineral.category
- Phyllosilicate minerals
- Mineral.image
- Macdonaldite-356329.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- White sprays of macdonaldite and blue botryoidal crust of mcguinnessite
- Mineral.formula
- BaCa4Si16O36(OH)2·10H2O
- Mineral.IMAsymbol
- Mcd
- Mineral.strunz
- 9.EB.05
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Cmcm
- Mineral.unit cell
- a = 14.06 Å, b = 23.52 Å, c = 13.08 Å; Z = 4
- Mineral.color
- Colorless, white
- Mineral.habit
- Acicular also fibrous, in radiating aggregates; granular
- Mineral.cleavage
- {010} perfect, {001} good, {100} indistinct
- Mineral.mohs
- 3.5–4.0
- Mineral.luster
- Vitreous – silky
- Mineral.refractive
- nα = 1.518 nβ = 1.524 nγ = 1.530
via Wikipedia infobox
Wikidata facts
- Image
- Macdonaldite-356329.jpg
Show 6 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 9.EB.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EB.05
- Commons category
- Macdonaldite
- IMA Mineral Symbol
- Mcd
- chemical formula
- BaCa₄Si₁₆O₃₆(OH)₂·10H₂O
- Strunz 8th edition (series ID, updated)
- VIII/E.15
Sources (2)
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- References
{{Infobox mineral | name = Macdonaldite | category = Phyllosilicate minerals | image = Macdonaldite-356329.jpg | imagesize = 260px | caption = White sprays of macdonaldite and blue botryoidal crust of mcguinnessite | formula = BaCa4Si16O36(OH)2·10H2O | IMAsymbol = Mcd | strunz = 9.EB.05 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Cmcm | unit cell = a = 14.06 Å, b = 23.52 Å, c = 13.08 Å; Z = 4 | color = Colorless, white | habit = Acicular also fibrous, in radiating aggregates; granular | twinning = | cleavage = {010} perfect, {001} good, {100} indistinct | fracture = | tenacity = | mohs = 3.5–4.0 | luster = Vitreous – silky | refractive = nα = 1.518 nβ = 1.524 nγ = 1.530 | opticalprop = Biaxial (+/−), surface relief – low, | dispersion = Weak | birefringence = 0.012 | pleochroism = | 2V = Measured: 90° | streak = White | gravity = 2.27 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = }} Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O. Macdonaldite was first described in 1965 and named for Gordon A. Macdonald (1911–1978) an American volcanologist at the University of Hawaii.
Macdonaldite crystallises in the orthorhombic system. Macdonaldite is anisotropic with low relief.