Mineralienatlas (name for mineral atlas) is the platform for people interested in mineralogy, geology, palaeontology and mining since 2001. We operate a significant database for minerals, fossils, rocks and their localities. Mineralienatlas is not limited to a section. We bring together information and inform comprehensive.

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Geolitho Foundation non-profit GmbH is the non-profit supporter of the Mineral Atlas (Mineralienatlas), the Lithotheque, the Geolitho Collection Management and the Marketplace and Store by collectors for collectors. The Foundation promotes public education in the field of mineralogy, geology, paleontology and mining by operating, maintaining and further expanding earth science projects.
 
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Olivine is not a se­parate min­er­al, but a mem­ber be­long­ing to the fors­terite-fay­alite mix­ing se­ries. Olivine be­longs to the olivin-groupe whose end-mem­bers are cal­cio-olivine and tephroite. Fors­terite is a mag­ne­si­um sil­i­cate; fay­alite an iron sil­i­cate. If com­mon­ly is spo­ken of olivine, it is usu­al­ly ... moreOlivine is not a separate mineral, but a member belonging to the forsterite-fayalite mixing series. Olivine belongs to the olivin-groupe whose end-members are calcio-olivine and tephroite. Forsterite is a magnesium silicate; fayalite an iron silicate. If commonly is spoken of olivine, it is usually a more or less iron-rich forsterite. The color of olivine is generally yellowish green, olive green to black. You will find much more interesting details in our portrait about this common mineral series.

Written and investigated by Peter Seroka. (Article in german)
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Die Geschichte der Pforte-Flu­o­rite ist eines der span­nen­den Kapi­tel der Min­er­alo­gie. Diese Flu­o­rite haben mich fasziniert, seit ich in den frühen 1970er Jahren in einem Sch­muck- und Min­er­alien­la­den in München die er­sten grü­nen "South Afri­can emer­alds", die sog. "grü­nen südafrikanischen Smaragde" von ... moreDie Geschichte der Pforte-Fluorite ist eines der spannenden Kapitel der Mineralogie. Diese Fluorite haben mich fasziniert, seit ich in den frühen 1970er Jahren in einem Schmuck- und Mineralienladen in München die ersten grünen "South African emeralds", die sog. "grünen südafrikanischen Smaragde" von der Pforte in Form eines prächtigen Colliers in der Hand hielt, ohne zu ahnen, dass diese „Smaragde“ in Wirklichkeit grüne geschliffene Fluorite waren. Eine erste Stufe mit dunkelvioletten Fluoritoktaedern mit der Fundortangabe "Pforte" habe ich 1973 bei Walter Khan in Wedesbüttel erstanden, diese aber in Unwissenheit ihrer geschichtlichen Bedeutung irgendwann in Spanien vertauscht. Die schönsten Pforte-Fluorite allerdings konnte ich während der Vorbereitungsarbeit zu einer großen mineralogischen Namibia-Reise im Jahr 1998 in einer bedeutenden deutschen Namibia-Sammlung bestaunen. Zu dieser Zeit gehörte Fluorit zu meinen bevorzugten Mineralien. Ich kannte nicht nur unzählige weltweite Vorkommen, sondern hatte in vielen Jahren selbst eine umfassende Fluoritsammlung aufgebaut. Solche Fluorite jedoch, wie ich sie in dieser Sammlung sah, waren mir bisher in dieser Schönheit nicht untergekommen, leider gab es zu der Herkunft dieser Kristalle so gut wie keine Informationen und – wie leicht zu erraten - leider auch keine Stufen auf dem Markt. - Ein Bericht von Peter Seroka
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... Among the most spec­tac­u­lar finds are the fan­tas­tic light blue calcites from the Ju­lia mine in Bil­bao, which en­rap­tured col­lec­tors' hearts to about the mid-1970s. At about the same time the zinc mine Las Man­fo­ras at Ali­va sup­plied ex­cel­lent, highl lus­trous Calcites, of­ten as­so­ci­at­ed with the worl ... more... Among the most spectacular finds are the fantastic light blue calcites from the Julia mine in Bilbao, which enraptured collectors' hearts to about the mid-1970s. At about the same time the zinc mine Las Manforas at Aliva supplied excellent, highl lustrous Calcites, often associated with the world's best red Sphalerites. ...

Amonsgt the forms of calcite the pinacoid is unique as it consists of exactly two parallel and oriented perpendicular to the c-axis surfaces. All other Calcite forms have either six or twelve areas. The pinacoid is an open form, with which it can not really include space; so the pinacoid must accompany other forms on the calcite crystal ...

A mineral portrait written by Peter Seroka with contributions from Ingo Löffler, Edgar Müller, Rainer Albert, William Waltermann (written in German)
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From ear­ly tun­nel con­struc­tion in the 18th cen­tu­ry to its fi­nal clo­sure in the 1950s, the Franken­holz Mine in Ger­many’s Saar re­gion was a key site of coal min­ing his­to­ry. With am­bi­tious shaft pro­jects, its own ca­ble­way con­nec­tion to Bexbach, and re­mark­able ge­o­log­i­cal fea­tures – in­clud­ing fos­sil disc ... moreFrom early tunnel construction in the 18th century to its final closure in the 1950s, the Frankenholz Mine in Germany’s Saar region was a key site of coal mining history. With ambitious shaft projects, its own cableway connection to Bexbach, and remarkable geological features – including fossil discoveries and natural oil seepages – the mine reflects both the rise of industrial progress and the dangers of underground work. Gas explosions, water ingress, and tragic accidents shaped the lives of thousands of miners. Frankenholz remains a compelling reminder of a bygone mining era.
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