Find the traditional scale here and a chart of select gems ordered by hardness. Some Galena may contain up to 1% silver in place of lead. Cleavage/Fracture: Cleavage is perfect, cubic with three directions at right angles.. It can even be colorless. Associated minerals include: smithsonite, sphalerite, cerussite, anglesite, and galena. It’s a semi-precious stone that is extremely rare due to supply & demand and mining it is extremely difficult. The Mohs hardness scale measures a mineral's resistance to scratching. . Diagnostic properties in hand specimens are its crystal habit, hardness, specific gravity, and its effervescence with cold hydrochloric acid. Sphalerite ((Zn, Fe)S) is a mineral that is the chief ore of zinc.It consists largely of zinc sulfide in crystalline form but almost always contains variable iron.When iron content is high, sphalerite is an opaque black variety called marmatite. Hardness: 2.5-3. Galena, Cubic, Approximately 2.5″-3″ Length, 1 1/4lbs., Single Piece; Galena is most abundant and widely found sulfide mineral and other name is lead glance .It is most important minerals of lead and silver.Crystal system is cubic, isometric system and xpl features not observed. The large volume of Galena that is processed for lead produces enough Silver as a by product to make Galena the leading ore of Silver. A nice large cabinet … Galena Formula PbS Crystal System Isometric Crystal Habit Euhedral Crystals, Massive - Granular, Massive Cleavage Perfect, Perfect, Perfect Luster Metallic Color light lead gray, dark lead gray Streak grayish black Class Isometric - Hexoctahedral Fracture Brittle Hardness 2.5 Boltsburn Mine, Rookhope, Weardale, County Durham, United Kingdom - Matrix with one side displaying lots of cubo-octahedral galena crystals in association with small colourless fluorite crystals. Mineral Name: Galena. To quote Allen N Wollscheidt, "Galena, back 75 years ago, was the stuff -- the crystal -- of crystal radio sets. The rear of the specimen is covered in dark brown siderite crystals. There are also larger, second generation fluorite crystals which are a transparent light blue colour. Chemical Composition: PbS.. Color: The mineral, if fresh, is bright silver in color with a metallic luster and dulls into a lead grey color as it tarnishes (1).. Streak: Lead grey to black. 1) Galena 2) Olivine 3)Garnet 4) Biotite Mica 22.Which mineral has a greater hardness? 1) 1.8 g/cm3 2)5.7 g/cm3 3) 6.1 g/cm3 4) 12.2 g/cm3 23.What is the approximate density of a mineral with a mass of 262.2 grams that displaces 46 cubic centimeters of water? Galena has a hardness of about 2.5 on Mohs hardness scale which is about as hard as your finger nail. Yes, due to its popularity, sadly larimar is one of the hottest crystal fakes on the market. It has a metallic luster and a black to dark gray color and streak. Although it’s too fragile for making jewelry because of its 3.5 to 4.0 rating on the hardness scale, collectors find it a magnificent crystal. Sphalerite is usually found in association with the minerals galena, pyrite (and other sulfides), calcite, dolomite, and fluorite. Galena usually occurs in cubic crystals. If you hit a specimen of galena with a hammer it will shatter into small perfect cubic crystals. Sphalerite’s colors look black at first glance. This crystal usually comes in different colors, including white, green, yellow, red, brown, and black.
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