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Micaceous Minerals 3

Sunday, 19 February 2017 08:00 AM

Not all micaceous looking minerals fall in the MICA group of phyllosilicate minerals. Many of the other silicates appear micaceous but are not. We'll have a look at some of these minerals and hopefully explain the difference. Take a look at our article on Mica and Other Micaceous Minerals.

SOLD

Muscovite

var. fuchsite - #BM43856

Details
Data
Provenance
Resources

Locality: Minas Gerais, Brazil
Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 11 x 6 x 4 cm - Cabinet

Light but rich green chromium Muscovite called fuchsite.

Muscovite

Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Massive - Lamellar, Foliated, Micaceous
Cleavage: Perfect, None, None
Luster: Vitreous (Glassy)
Color: white, gray, silver white, brownish white, greenish white
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle - Sectile
Hardness: 2-2.5

Collection: McConlogue Collection

Mineralpedia: View Muscovite
On Dakota Matrix: Previously Sold Muscovite
On Dakota Matrix: Other Available Muscovite
WebMineral: View Muscovite
Mindat: View Muscovite

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Muscovite

var. gilbertite - #PD30953

Details
Data
Provenance
Resources

Locality: Gunheath China Clay Pit, St. Austell, Cornwall, England
Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 8 x 6.5 x 4.5 cm - Sm Cabinet

This is a variety of Muscovite usually fine-grained.

Muscovite

Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Massive - Lamellar, Foliated, Micaceous
Cleavage: Perfect, None, None
Luster: Vitreous (Glassy)
Color: white, gray, silver white, brownish white, greenish white
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle - Sectile
Hardness: 2-2.5

Collection: Phillips Collection

Mineralpedia: View Muscovite
On Dakota Matrix: Previously Sold Muscovite
On Dakota Matrix: Other Available Muscovite
WebMineral: View Muscovite
Mindat: View Muscovite

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Paragonite

#46474

Details
Data
Provenance
Resources

Locality: Slyudorudnik mine, Kyshtym, Chelyabinsk Oblast', Urals, Russia
Formula: NaAl₂(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 4 x 2.5 x 1.5 cm - Miniature
Special Info: XRD Confirmed
Special Info: EDS Confirmed

Light green flashy micaceous plates of Paragonite, positively identified by Dr. Igor Pekov.

Paragonite

Formula: NaAl₂(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Scaly, Massive - Fibrous
Cleavage: Perfect, None, None
Luster: Pearly
Color: white, yellow
Streak: white
Class: Monoclinic
Hardness: 2.5

Special Info: XRD Confirmed
Special Info: EDS Confirmed

Mineralpedia: View Paragonite
On Dakota Matrix: Previously Sold Paragonite
On Dakota Matrix: Other Available Paragonite
WebMineral: View Paragonite
Mindat: View Paragonite

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Paragonite

#PD46716

Details
Data
Provenance
Resources

Locality: Slyudorudnik mine, Kyshtym, Chelyabinsk Oblast', Urals, Russia
Formula: NaAl₂(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 2 x 1 x 1 cm - Thumbnail

Light green plates of micaceous Paragonite, and sodium mica.

Paragonite

Formula: NaAl₂(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Scaly, Massive - Fibrous
Cleavage: Perfect, None, None
Luster: Pearly
Color: white, yellow
Streak: white
Class: Monoclinic
Hardness: 2.5

Collection: Phillips Collection

Mineralpedia: View Paragonite
On Dakota Matrix: Previously Sold Paragonite
On Dakota Matrix: Other Available Paragonite
WebMineral: View Paragonite
Mindat: View Paragonite

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Phlogopite

#PD46683

Details
Data
Provenance
Resources

Locality: Otter Lake, Quebec, Canada
Formula: KMg₃(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 8 x 5 x 5 cm - Sm Cabinet

Dark almost black mass of Phlogopite mica.

Phyllosilicate - Monoclinic - Mica group member. Phologpite is classified as an Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.