About: dbkwik:resource/n2etGcwtHY0vB3fbM4KCQQ==   Sponge Permalink

An Entity of Type : dbkwik:resource/6IIoeMLPkySiK--1vpcViQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

AttributesValues
rdf:type
rdfs:label
  • Hemimorphite
rdfs:comment
  • Hemimorphite, is a sorosilicate mineral which has been mined from days of old from the upper parts of zinc and lead ores, chiefly associated with smithsonite. It was often assumed to be the same mineral and both were classed under the same name of calamine. In the second half of the 18th century it was discovered that there were two different minerals under the heading of calamine - a zinc carbonate and a zinc silicate, which often closely resembled each other.
sameAs
dcterms:subject
dbkwik:ceramica/pr...iPageUsesTemplate
mohs
  • 45(xsd:integer)
Solubility
  • Soluble in acid
Gravity
  • 3516(xsd:integer)
Name
  • Hemimorphite
Caption
  • Hemimorphite from Mapimi, Durango, Mexico
formula
  • Zn4Si2O72·H2O
System
Color
  • White, blue, greenish
cleavage
  • Perfect
habit
  • Polar crystals, with different or hemimorphic ends. Also coxcomb masses, mammillary, stalactitic, or massive
fracture
  • Uneven to conchoidal
refractive
  • Transparent to translucent
luster
  • Vitreous, silky
abstract
  • Hemimorphite, is a sorosilicate mineral which has been mined from days of old from the upper parts of zinc and lead ores, chiefly associated with smithsonite. It was often assumed to be the same mineral and both were classed under the same name of calamine. In the second half of the 18th century it was discovered that there were two different minerals under the heading of calamine - a zinc carbonate and a zinc silicate, which often closely resembled each other. The silicate was the more rare of the two, and was named hemimorphite because of the hemimorph development of its crystals. This unusual form, which is typical of only a few minerals, means that the crystals are terminated by dissimilar faces. Hemimorphite most commonly forms crystalline crusts and layers, also massive, granular, rounded and reniform aggregates, concentrically striated, or finely needle-shaped, fibrous or stalactitic, and rarely fan-shaped clusters of crystals. Some specimens show strong green fluorescence in shortwave ultraviolet light (253.7 nm) and weak light pink fluorescence in longwave UV.
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