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This listing is for a really fascinating epidote specimen in a display jar,
including an info card about this mineral and the location this specimen came from.
This kit is great for avid mineral specimen collectors or beginners.
It would be a perfect gift set for getting someone interested in mineral collecting and science.
The 1 centimeter scale cube is for size comparison only. It is not included in the sale.
The photos are of several different specimens, but this listings is for one specimen with an info card.
The photos show multiple specimens to give a representation of the variety of shapes and colors in these specimens.I offer a shipping discount for customers who combine their payments for multiple purchases into one payment!
The discount is regular shipping price for the first item and just 50 cents for each additional item!
To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart.
sales you win are added to your cart automatically.
For any \"buy it now\" items or second chance offers, be sure to click the \"add to cart\" button, NOT the \"buy it now\" button.
Onceall of your items are in your cart just pay for them from your cart andthe combined shipping discount should be applied automatically.I offer a money back guarantee on every item I sell.
If you are not 100% happy with your purchase just send me a message to let me know
and I will buy back the item for your full purchase price.Hi there. I am selling this really lovely epidote mineral specimen. It is from Pampa Blanca, Peru. If you have any questions, do not hesitate to ask me. Have fun offerding, thanks so much for visiting my sale and have a great day!
The following is a wikipedia entry about epidote:
This article is largely based on an article in the out-of-copyright Encyclopædia Britannica Eleventh Edition, which was produced in 1911. It should be brought up to date to reflect subsequent history or scholarship (including the references, if any). When you have completed the review, replace this notice with a simple note on this article\'s talk page. (November 2019)
Epidote
Epidote - Canta, Lima, Peru.jpg
Epidote crystals
General
Category unit) symbol Ep[1]
Crystal system Monoclinic
Crystal class Prismatic (2m)
(same H-M symbol)
Space group P21/m
Identification
Color Pistachio-green, yellow-green, greenish black, brownish-green, green, black
Crystal habit Prismatic with striations, fibrous, massive
Twinning On [100]
Cleavage {001} perfect and {100} imperfect
Fracture Flat regular to uneven
Mohs scale hardness 6–7
Luster Vitreous to resinous
Streak Greyish white
Diaphaneity Transparent to nearly opaque
Specific gravity 3.38-3.49
Optical properties Biaxial (-)
Refractive index nα = 1.715–1.751
nβ = 1.725–1.784
nγ = 1.734–1.797
Birefringence δ = 0.019–0.046
Pleochroism Strong
References [2][3][4]
Epidote is a calcium aluminium iron sorosilicate developed crystals of epidote, Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH), crystallizing in the monoclinic system, are of frequent occurrence: they are commonly prismatic in habit, the direction of elongation being perpendicular to the single plane of symmetry. The faces are often deeply striated and crystals are often twinned. Many of the characters of the mineral vary with the amount of iron present for instance, the color, the optical constants, and the specific gravity. The color is green, grey, brown or nearly black, but usually a characteristic shade of yellowish-green or pistachio-green. It displays strong pleochroism, the pleochroic colors being usually green, yellow and brown. Clinozoisite is green, white or pale rose-red group species containing very little iron, thus having the same chemical composition as the orthorhombic mineral zoisite.[5] The name, due to Haüy, is derived from the Greek word \"epidosis\" (ἐπίδοσις) which means \"addition\" in allusion to one side of the ideal prism being longer than the other.
Epidote is an abundant rock-forming mineral, but one of secondary origin. It occurs in marble and schistose rocks of metamorphic origin. It is also a product of hydrothermal alteration of various minerals (feldspars, micas, pyroxenes, amphiboles, garnets, and others) composing igneous rocks. A rock composed of quartz and epidote is known as epidosite. Well-developed crystals are found at many localities: Knappenwand, near the Großvenediger in the Untersulzbachthal in Salzburg, as magnificent, dark green crystals of long prismatic habit in cavities in epidote schist, with asbestos, adularia, calcite, and apatite; the Ala valley and Traversella in Piedmont; Arendal in Norway; Le Bourg-d\'Oisans in Dauphiné; Haddam in Connecticut; Prince of Wales Island in Alaska, here as large, dark green, tabular crystals with copper ores in metamorphosed limestone.[5]
The perfectly transparent, dark green crystals from the Knappenwand and from Brazil have occasionally been cut as gemstones.[5]
Related species
Belonging to the same isomorphous group with epidote are the REE-rich allanite (containing primarily lanthanum, cerium, and yttrium), and the manganese-rich piemontite.
Piemontite occurs as small, reddish-black, monoclinic crystals in the manganese mines at San Marcel, near Ivrea in Piedmont, and in crystalline schists at several places in Japan. The purple color of the Egyptian porfido rosso antico is due to the presence of this mineral.[5]
Allanite and dollaseite-(Ce) have the same general epidote formula and contain metals of the cerium group. In external appearance allanite differs widely from epidote, being black or dark brown in color, pitchy in lustre, and opaque in the mass; further, there is little or no cleavage, and well-developed crystals are rare. The crystallographic and optical characters are similar to those of epidote; the pleochroism is strong with reddish-, yellowish-, and greenish-brown colors. Although not a common mineral, allanite is of fairly wide distribution as a primary accessory constituent of many crystalline rocks, gneiss, granite, syenite, rhyolite, andesite, and others. It was first found in the granite of east Greenland and described by Thomas Allan in 1808, after whom the species was named. Allanite is a mineral readily altered by hydration, becoming optically isotropic and amorphous: for this reason several varieties have been distinguished, and many different names applied. Orthite was the name given by Jöns Berzelius in 1818 to a hydrated form found as slender prismatic crystals, sometimes a foot in length, at Finbo, near Falun in Sweden.[5] Dollaseite is less common, famous from the Ostanmossa mine in the Norberg district of Sweden.
