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Monday Daily Feed, March 20, 2017

March 21, 2017
The Rockhound Connection
and numerous quotes and images from my Facebook friends.
These are the images and quotes that appeal to my sensibilities or the lack thereof.

Enjoy!  R
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Fantastic Rubellite Tourmaline, Quartz, MIca, Cleavelandite and Orthoclase from Pyingyi Taung (Pyin Gyi Taung), Mandalay Division, Myanmar.
Rudolf Watz Specimen.
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Mark Anthony Chapman

Pink Tanzanite….what an exquisite crystal
Image may contain: one or more people, outdoor and nature
Kronosaurus fossil. Can you even imagine what this looked like when it was swimming through the ocean?
Smoky Quartz. Yes, I believe that would fit on the mantle. R
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Prehnite and epidoto
Location: Bendoukou, Mali, Africa
Size: 3.8 cm
Photo: Benjamin Decamp published in mineral photography

The Prehnite is an ore of the group of silicates, subgroup phyllosilicates. It’s a calcium aluminosilicate and aluminium, although part of aluminum can be replaced in up to 7 % for iron. Is almost always in masses with Esferulitos Stringy-Irradiated, on other occasions like crystals tabular ridges. You can also appear as aggregate or scabs botroidales, globular, etc. In all cases of a beautiful green color that is unique.
Named in honour of its discoverer, the German Colonel Von Prehn, who brought the ore in 1788 of the cape of good hope (South Africa). Synonyms in Spanish very little used are adeilita, chiltonita, coufolita or edelita.
It’s a secondary mineral formed in the cracks of the basic volcanic rocks, provided that they are rich in calcium. Also in igneous rocks and less frequently as a product of low grade metamorphism. In all of them, it may appear filled cavities in the rock in the form of a geode or tapizando fractures.
It’s typical hydrothermal mineral secondary, produced from the alteration of basic plagioclasas gabros and amphibolite.
Usually always next to zeolites, so that it is often classified as such; but the zeolites are tectosilicatos and prehnite is phyilosilicates. It’s very typical of their association with zeolite called laumontite. Other Minerals Associates are datolite, girolita, fluorapofilita, quartz, calcite, copper, pectolite, stilbite and other zeolites.
There are some notable occurrences in cape of good hope (South Africa), various parts of the United States, Bombay, India, Germany and many other countries was spread throughout the world. In Dauphiné (France) are magnificent aggregates in the form of a barrel. In Spain they have found good specimens in Sheffield (Murcia) and carchelejo (London).
It’s seldom used as decorative stone, although it can be carved into a precious gem. The main interest is the scientist and coleccionístico.

The Epidote is a mineral sorosilicatado calcium and iron, Aluminium, which responds to the Formula Ca2 (Al, FE) 3 (sio4) 3 (oh). It crystallizes in the monoclinic system. Has well-formed crystals with a certain frequency, commonly with a prismatic habit, with an address of elongation perpendicular to the plane, only one, of symmetry. Its facets are usually striated in depth. Most of the characters of minerals, such as the color, the constant optics, and the specific gravity vary depending on the content of the iron. Its hardness is 6,5. the colour is green, brown or gray, almost black, but the most common is that they possess a characteristic glow green, with yellow undertones or pistachio. The Pleochroism is strong, and the colors pleiocroicos are the green, yellow and brown. However, the clinozoisite, a type of epidote, is white or pale pink, due to their low iron content; it has the same chemical composition, in fact, that the mineral zoisite.
The Epidote is a common component of the rocks, but their origin is secondary. The mineral is formed when limestone and shale suffer metamorphism. It can also arise for hydrothermal alteration of feldspar, micas, keep your pyroxenes, amphiboles, garnets and other components, all of them of igneous rocks.
This is a mineral that is transparent, with crystals of a dark green color. In Brazil were used as gems occasionally.
There are two isomorphic of epidote: Piemontite and allanite, which are considered epidotas of manganese and cerium, respectively.
The piemontite owns monoclinic crystals dark red, size small; it comes from mines of manganese in San Marcel, near Piedmont, and crystalline shales in some places in Japan. The Color Purple of Egyptian Porphyry Rosso Antico is due to the presence of this mineral.
The Allanite possesses the same general formula that the epidote, but contains minerals of the group of the cerium. Has a different appearance of epidote, with a black or dark brown and a tone opaque; crystallizes with difficulty, for which usually lead to amorphous minerals. The Pleochroism is very strong, turning toward the red, yellow and grey. Despite the fact that it is a rare mineral in abundance, is widely distributed in the world, especially next to gneiss, pimples, and rhyolites sienitas andesitas. Its discoverer was Thomas Allan that, in 1808, described the allanite in East Greenland.
A variant hydrated crystals binoculars of allanite, therefore a rich epidote cerium, too, is the ortita, described in Sweden for jons berzelius in 1818.

Amazing footage of the Viedma Glacier calving in Patagonia
Pyromorphite is a mineral species composed of lead chlorophosphate: Pb5(PO4)3Cl, sometimes occurring in sufficient abundance to be mined as an ore of lead. H = 3.5 – 4.0.” R
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Geology Page

Pyromorphite | #Geology #GeologyPage
Chemical Formula: Pb5(PO4)3Cl
Locality: Minas de Horcajo, Ciudad Real, Castile-La Mancha, Spain
Picture width 4.5 mm
Photo Copyright © Christian Rewitzer
“Chalcopyrite (pronunciation: /ˌkælkəˈpaɪraɪt, -koʊ-/[6][7] KAL-ko-PY-ryt) is a copper iron sulfide mineral. It has the chemical formula CuFeS2. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. ” Wikipedia. A copper ore mineral > Copper Hill and Ducktown, TN. R


The Stone Hill mine (also known as the Woods mine) was discovered in 1874, and worked 1874 to 1879, and 1896 to 1899. Production was hampered by poor transportation. The ore is massive and disseminated sulfides in hornblende schist of Precambrian or Paleozoic age. Principal ore minerals are chalcopyrite and sphalerite, which occur with pyrrhotite, pyrite, and quartz. Two other copper prospects, the Johnston prospect and the Smith prospect, are nearby, but it is not known that any copper was produced from them.[9]
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Minerals And Fossils

Calcopirite: CuFeS2
Peridot (/ˈpɛrᵻdɒt/ or /ˈpɛrᵻdoʊ/) is gem-quality olivine, which is a silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is the magnesium-rich variety of olivine (forsterite), the formula approaches Mg2SiO4. H = 6.5 – 7.0.” Wikipedia. August Birthstone. R
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Reassuringly Random

Peridot with ludwigite inclusions. By
Crocoite is a mineral consisting of lead chromate, PbCrO4,. It is identical in composition with the artificial product chrome yellow used as a paint pigment. H = 2.5 – 3. Wikipedia     R
Image may contain: food
Tasmanian Crocoite from Adelaide mine, Tasmania, Au. 😍😍
Photo credite: D.McL. ©
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