About: dbkwik:resource/5rRTdL27ur1W5PuFhKrACA==   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
  • Hydroxylapatite
rdfs:comment
  • Hydroxylapatite, also often incorrectly called hydroxyapatite, is a mineral. It is a naturally occurring form of calcium apatite with the formula Ca5(PO4)3(OH), but is usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two molecules. Hydroxylapatite is the hydroxyl endmember of the complex apatite group. The OH- ion can be replaced by fluoride, chloride or carbonate. It crystallizes in the hexagonal crystal system. It has a specific gravity of 3.08 and is 5 on the Mohs hardness scale. Pure hydroxylapatite powder is white. Naturally occurring apatites can however also have brown, yellow or green colorations. Compare to the discolorations of dental fluorosis.
sameAs
dcterms:subject
dbkwik:ceramica/pr...iPageUsesTemplate
Category
  • Mineral Species
opticalprop
  • Uniaxial
mohs
  • 5(xsd:integer)
Molweight
  • 50231(xsd:integer)
Name
  • Hydroxylapatite
ImageSize
  • 250(xsd:integer)
Caption
  • Hydroxylapatite crystals on matrix
streak
  • White
formula
  • Ca53
System
  • Hexagonal - Dipyramidal
Color
  • Colorless, White, Gray, Yellow, Yellowish green
cleavage
  • Indistinct
habit
  • Massive to cyrstaliine, major bone forming mineral
diaphaneity
  • Transparent to Opaque
refractive
  • nω = 1.651 nε = 1.644
luster
  • Vitreous to dull
Density
  • 308(xsd:integer)
birefringence
  • δ = 0.007
abstract
  • Hydroxylapatite, also often incorrectly called hydroxyapatite, is a mineral. It is a naturally occurring form of calcium apatite with the formula Ca5(PO4)3(OH), but is usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two molecules. Hydroxylapatite is the hydroxyl endmember of the complex apatite group. The OH- ion can be replaced by fluoride, chloride or carbonate. It crystallizes in the hexagonal crystal system. It has a specific gravity of 3.08 and is 5 on the Mohs hardness scale. Pure hydroxylapatite powder is white. Naturally occurring apatites can however also have brown, yellow or green colorations. Compare to the discolorations of dental fluorosis. Seventy percent of bone is made up of the inorganic mineral hydroxylapatite. Carbonated-calcium deficient hydroxylapatite is the main mineral of which dental enamel and dentin are comprised.
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