Item#2: Native Copper

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Cuprul nativ apare ca depozit hidrotermal asociat cu alterarea rocilor eruptive si vulcanice sau in infiltratiile poroase ale rocilor sedimentare. Ocurenta este comuna, insa doar in cantitati foarte mici.

Native copper occurs as a hydrothermal deposit associated with alteration of igneous and volcanic rocks, or infiltrating porous sedimentary rocks. Native copper, though widely distributed, occurs only in small amounts.

Sistemul de cristalizare/ Cristal system: cubic

Habitus: dendritic, ramuros; cristale cubice sau dodecaedrice/ dendritic, branching forms, cubic or rhombododecahedral crystals.

Culoare/ Colour: rosu/ copper-red

Clivaj/ Cleavage: nu/ none

Duritate/ Hardness: 2.5-3

Luciu/ Luster: metalic

Transparenta/ Transparency: opac

Alte proprietati/ Other: ductil, solubil in acid azotic; ductility, readily soluble in nitric acid.

The photos can be used if source is acknowledged.

Item#1: Echinolampas

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Genul Echinolampas (echinid exociclic) este caracteristic Bazinului Tranilvaniei. Corespunde perioadei Eocene. Exemplarul expus a fost gasit pe Valea Somesului Mic in calcarele ce corespund unitatatii litostratigrafice a Calcarului de Cluj (Hofmann, 1879).

Dimensiuni: 7 x 6,5 x 4,5 cm; greutate: 150 g. [size.jpg]

The genus presented here is an sub-circular echinoid which is typical for the Transylvanian Basin. It is dated from the Eocene. The individual you see in the picture was found in Somesul Mic Valley in limestones from the litostratigraphic unit of Cluj Limestone.

The photos can be used if source is acknowledged.  

Check out My Web Museum!

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Check it out each week in ‘My Web Museum’ category!

Hi there!

… just thought about doing something very cool at the beginning of this year. and so I got the idea of posting my rock-mineral-fossil samples (and maybe some bio-representatives as well) as in a small web museum. thought it is very fashionable , eh?

😀

so it will be one item per week. 🙂