About: Hessonite   Sponge Permalink

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

Hessonite is a calcium aluminum mineral, and was first found by A. H. Church. Most gems that people thought were zircon for example were really hessonite. Often presented in the color red but also orange and yellow.

AttributesValues
rdf:type
rdfs:label
  • Hessonite
  • Hessonite
rdfs:comment
  • Hessonite is a calcium aluminum mineral, and was first found by A. H. Church. Most gems that people thought were zircon for example were really hessonite. Often presented in the color red but also orange and yellow.
  • It has a characteristic red color, inclining to orange, much like that of gem zircon. Indeed it was shown many years ago, by Sir A. H. Church, that many gems, especially engraved stones, commonly regarded as zircon, were really hessonite. The difference is readily detected by the specific gravity, that of hessonite being 3.64 to 3.69, whilst that of zircon is about 4.6. Hessonite has a similar hardness to that of quartz, about 7 on the mohs scale, whilst the hardness of most garnet species can reach 7.5.
dcterms:subject
cleave
  • None, or indistinct
dbkwik:ceramica/pr...iPageUsesTemplate
dbkwik:wowwiki/pro...iPageUsesTemplate
Category
  • variety of the grossular species
opticalprop
  • Single refractive, often anomalous double refractive
mohs
  • 7(xsd:integer)
Gravity
  • 364(xsd:integer)
Name
  • Hessonite
  • Hessonite
Type
  • Calcium aluminum
Caption
  • Striated crystals of hessonite
dbkwik:geology/pro...iPageUsesTemplate
SG
  • 6(xsd:double)
formula
  • Ca3Al2Si3O12
Polish
  • vitreous
System
  • cubic
Hard
  • 7(xsd:integer)
pleochroism
  • none
RM
  • Mineral
cleavage
  • none, sometimes indistinct parting
Pro
  • Hehs-uh-night
fracture
  • conchoidal to uneven
birefringence
  • none
abstract
  • Hessonite is a calcium aluminum mineral, and was first found by A. H. Church. Most gems that people thought were zircon for example were really hessonite. Often presented in the color red but also orange and yellow.
  • It has a characteristic red color, inclining to orange, much like that of gem zircon. Indeed it was shown many years ago, by Sir A. H. Church, that many gems, especially engraved stones, commonly regarded as zircon, were really hessonite. The difference is readily detected by the specific gravity, that of hessonite being 3.64 to 3.69, whilst that of zircon is about 4.6. Hessonite has a similar hardness to that of quartz, about 7 on the mohs scale, whilst the hardness of most garnet species can reach 7.5. Hessonite comes chiefly from Sri Lanka, where it is found generally in placer deposits, though its occurrence in its native matrix is not unknown. It is also found in Brazil and California.
is var of
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