General Chemistry I11-STEMCRYSTALLINE AND AMORPHOUS SOLID REPORTPeter Ben J. CabinianApril 22, 2021Mr. Edison OrgilRepublic of the PhilippinesDepartment of EducationRegion IIIDivision of Nueva EcijaJULIA ORTIZ LUIS NATIONAL HIGH SCHOOLSagaba, Sto. Domingo, Nueva Ecija
1Crystalline SolidGALENAGalena is the natural mineral form of lead sulfide (PbS) which means it contains an equalnumber of lead and sulfide ions. The ions are arranged in a cubic pattern that repeats in alldirections (King, 2016).The crystal system of this mineral is cubic or isometric with perfect cleavages, andcontract, penetration, and lamellar twinning. The mineral show subconchoidal structure, brittletenacity, and metallic luster on cleavage plane (Haldar, 2020).Properties and CharacteristicsChemical ClassificationSulfideColorFresh surfaces are bright silver in color with a bright metallic luster,tarnishes to a dull lead grayStreakLead gray to blackLusterMetallic on fresh surfaces, tarnishes dullDiaphaneityOpaqueCleavagePerfect, cubic, three directions at right anglesMohs Hardness2.5+Specific Gravity7.4 to 7.6Diagnostic PropertiesColor, luster, specific gravity, streak, cleavage, cubic or octahedralcrystals.Chemical CompositionLead sulfide, PbSCrystal SystemIsometricName: Peter Ben J. CabinianDate: April 22, 202111-STEMGeneral Chemistry I
2UsesGalena is by far the greatest ore of lead. The extraction process to remove the lead fromthe sulfur is very simple, thus lead has been extracted from Galena since the earliest times(Retrieved from:).