FMF - Friends of Minerals Forum, discussion and message board

[Firmo Espinar]

Emerald on Calcite from Muzo, Colombia.

[Firmo Espinar]

Aragonite from Soria, Spain.

Group of not perfectly defined Aragonite crystals dancing on a white matrix of massive Aragonite.
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Quartz from Minas Gerais, Brazil.

Single opaque crystal of amethyst quartz.

[Firmo Espinar]

To celebrate my fifty birthday today.

Atacamite and Chrysocolla from Copiapó, Chile.

Dark green needles and radial sprays of Atacamite and blue-green Chrysocolla covering the matrix.

[Firmo Espinar]

Quartz from San Cristobal, Santander, Colombia.
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Azurite and Malachite from Almería, Spain.
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Aragonite from Guadalajara, Spain.

Brown aragonite crystals showing the hexagonal prismatic habit, and twinned cyclically on {110}.

[Firmo Espinar]

Gypsum from Madrid, Spain.

Arrowhead gypsum.
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Erythrite from Almería, Spain.

Small radial crystals in appearance of Chinese hats.

[Firmo Espinar]

Pyrite from Navajún, La Rioja, Spain.
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Fluorapatite from Murcia, Spain.

[Firmo Espinar]

Quartz from San Cristobal, Santander, Colombia.
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Aragonite from Soria, Spain.

[Firmo Espinar]

Goethite from Huelva, Spain.

Red branch of Goethite with limonite in the backside in yellow and orange tones.
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Gypsum from Cuenca, Spain.

[Firmo Espinar]

Calcite pocket from Guadalajara, Spain.
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Azurite from Almería, Spain.

[Firmo Espinar]

Quartz from Boyacá, Colombia.

Tessin habit Quartz with something similar in the base to an internal fracture that is not obvious to the tact. It also has inclusions or bubbles arranged in a sloping plane.

[Pierre Joubert]

Interesting azurite specimen (IMG_5167.JPG)

[Firmo Espinar]

Hi Pierre, nice to hear from you and thanks for the message.

I take advantage of your post to share a rock of your continent, some kilometers to the north of your country.
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Dolomite-(Co) from Katanga, Congo D.R.

Shiny and intense pink crust of Dolomite-(Co) covering the matrix rock.
Ex J. Muizebelt (NL). Mined before 1.999.

[Bob Harman]

Nice specimen FRANJUNGLE !,

Like you alluded to in your posting, the example is COBALTOAN DOLOMITE. BOB

[Firmo Espinar]

Hi Bob, also nice to see you here. Thank you for the clarify.
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Quartz from Boyacá, Colombia.

Crazy Tessin habit Quartz, acquired in September 2017 in Medellín downtown, assuming that it is a Tessin.

This is the first Peñas Blancas specimen I´ve purchased, and I´m becoming a great follower of these Tessin. It´s the beginning of my small reservation of Peñas Blancas quartzes. I also try to study about these special crystals which delight me with their interesting habit.

It has a so aleatorial form with diverses kinds of horizontal growth lines and many faces at the top. There is a face absolutely different than the rest: is clearly translucent and very smooth all along. There is another curious face with some natural notches that look like white stars.

I post more pics of this crystal than usual trying to extract all its corners, cause I think it´s a good example from Peñas Blancas Mine.

[Firmo Espinar]

Celestine from Sakoany, Majunga, Madagascar.
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Calcite from Hunan, China.