EUCRYPTITE
EUCRYPTITE Eucryptite – LiAlSiO4 – is a rare nesosilicate found exclusively in lithium-bearing granitic pegmatites. It constitutes a secondary lithium ore; it is not the primary lithium ore mineral in the deposit. It is classified within the Phenakite Group and may contain Na and K. Identifying eucryptite macroscopically without the aid of an ultraviolet lamp […]
ENARGITE
ENARGITE Enargite – Cu3AsS4 – is a relatively rare copper sulfide, typical of certain deposits with very specific characteristics. It serves as an important copper ore when found in large volumes. Crystals are rare; they are typically thick tabular forms—or more rarely, striated prisms—reaching up to 15 cm in length. It contains impurities such as […]
ENSTATITE
ENSTATITE Enstatite – (Mg)2[Si2O6] – is an inosilicate of the Pyroxene Group, more specifically of the orthopyroxenes, the orthorhombic pyroxenes. It is a rarer mineral than clinopyroxenes (monoclinic pyroxenes such as augite, pigeonite, diopside, etc.), but an important rock former. It has no economic importance. Enstatite is one of the extremes of the Enstatite – […]
ERYTHRITE
ERYTHRITE Erythrite – Co3(AsO4)2.8H2O – is a rare arsenate, typical of the oxidation zone of Co ores. It is called “cobalt bloom” (“Kobaltblüte” in German) because it forms on primary minerals of Co and As, denouncing the existence of these. It is not a major ore mineral, but it is extremely useful for recognizing these […]
EUDIALYTE
EUDIALYTE Eudialyte – Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2 – is a very rare cyclosilicate, characteristic of some alkaline plutonic igneous rocks. It is marketed as a collector mineral and may constitute a Zr ore. Eudialyte is the main representative of the Eudialyte Group, composed of 46 members. It is not possible to confirm eudialyte macroscopically because several members of […]
EPIDOTE
EPIDOTE Epidote – {Ca2}{Al2Fe}(Si2O7)(SiO4)O(OH) – is a very common sorosilicate, very frequent as an accessory mineral in igneous and metamorphic rocks. It has no industrial use. Epidote is part of the Epidote Group, with clinozoisite and piemontite. Forms a series with clinozoisite. May contain Al, Mn and Mg. There are 22 synonyms for “epidote”. Epidote […]