FMF - Friends of Minerals Forum, discussion and message board

[Firmo Espinar]

Quartz from Segovia, Antioquia Department, Colombia. (Nº-87).

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Chrysocolla, Azurite from Bédar, Almería, Spain.

Field collected in 2013.

[Firmo Espinar]

Quartz (variey amethyst) from Las Vigas, Veracruz, Mexico.

Light amethyst over a thin white plate, some of them doubly terminated.

[Firmo Espinar]

Quartz from Segovia, Antioquia Department, Colombia. (Nº-88).

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Gypsum from Hornillos de Cerrato, Palencia, Spain.

Two opposing arrowheads.

[Firmo Espinar]

Chrysocolla and Malachite from de L´Etoile du Congo Mine, Lubumbashi, Haut-Katanga, Dem Rep. Congo.

It looks like a Van Gohg painting with thick brushstrokes.

[Firmo Espinar]

Gypsum from Granada, Spain.

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Pyrite from Huanzala Mine, Perú.

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Dravite (Tourmaline Group) from Minas Gerais, Brazil.

[Tobi]

[Firmo Espinar]

Thank you Tobi.
Nice to see you here.

Quickly we´ll talk with Alfredo Petrov, our fellow and a great scientific, to investigate about the new specie… Vincent would be very proud ;-)


And now a fluorescence pictures from an example bought in Bogotá.

Diopside from Grenville Scapolite Prospect, Québec, Canada.

Diopside on scapolite rock (variety wernerite). Blue violet fluorescence Diopside and yellow wernerite under UV light.
The wernerite variety is an intermediate member of the marialite-meionite series.

[Firmo Espinar]

Quartz from San Cristobal, Suaita, Santander Department, Colombia. (Nº-89).

[Firmo Espinar]

Quartz with Fluorite, Siderite and Pyrite from Panasqueira, Portugal.

[Tobi]

Nice Panasqueira specimen, Firmo!
What are the tiny reddish crystals, another generation of fluorite?

[Firmo Espinar]

Hi Tobi.

Thanks for your message.

The caramel-colored crystals perhaps look In the photo like octahedrons of a second fluorite generation.

But I´ve consulted with a great Panasqueira expert (our friend Jordi Fabre, overall FMF coordinator) and they are prisms with a rhombic section. It is siderite.

Best regards .

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This period at home, due the Covid-19, has allowed me to play with some software to get more decent photos. I hope you like some of them.

Quartz from Segovia, Antioquia Department, Colombia. (Nº-83)

A large top face with a symmetry axis in the crystallization surface.

[Firmo Espinar]

Gypsum from Villalbilla, Madrid, Spain.

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Apatite from Panasqueira, Portugal.

[Firmo Espinar]

Calcite from Preguiça Mine, Sobral, Portugal.

[Firmo Espinar]

Azurite from Almería, Spain.

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Erythrite from Almería, Spain.

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Quartz from San Cristobal, Suaita, Santander Department, Colombia. (Nº-91).

Through the loupe the inclusions seem very likely to be Goethite or limonite.

[Firmo Espinar]

Gypsum from Cauca Department, Colombia.

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Aragonite from Macael, Almería, Spain.

[Firmo Espinar]

Schorl from Santander Department, Colombia.

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Quartz from San Cristobal, Suaita, Santander Department, Colombia. (Nº-92).

Couple of translucent parallel crystals with a white top.

[Firmo Espinar]

Aragonite from Arbujuelo, Soria, Spain.

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Quartz (variety prase) from Estella, Navarra, Spain.

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Quartz from Azaila, Teruel, Spain.

[Firmo Espinar]

Calcite on Quartz geode from Choique Mine, Neuquén, Patagonia, Argentina. Acquired in Bogotá.

Scalenoedrals Calcite crystals on Hematite included Quartz geode with pale red shades.


Mineralogical Record February 2020 carries a report of this mine.

Min. Rec.: “These quartzs likewise owes its color to an iron cromophore and is not equivalent to rose quartz.
All geodes have quartz as the substrate, and calcite crystals are among the first minerals to form on the quartz”.

[Firmo Espinar]

Gypsum from Luzón, Guadalajara, Spain.

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Gypsum from La Almarcha, Cuenca, Spain.

[Firmo Espinar]

Gypsum from Fuentes de Ebro, Zaragoza, Spain.

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Dolomite with Chalcopyrite from León, Spain.