Delaware Geological Survey

Catalog of Delaware Minerals

Catalog of Delaware Minerals

enstatite (var. bronzite)
monazite
montmorillonite
allanite
ferrohornblende?
natrolite
alunite
anatase
gibbsite
andalusite var. chiastolite
glauconite
opal
andesine
glaucophane
anthophyllite
phlogopite
antigorite
piemontite (piedmontite)
arfvedsonite
augite
halotrichite
hexahydrite
rockbridgeite
hisingerite
brookite
scapolite group (undifferentiated)
bytownite
illite
jarosite
kaolinite
chamosite
starkeyite
chlorite
chloritoid
laumontite
chromite
lipscombite
lizardite (serpentine group)
chrysotile
maghemite
clinoptiolite
cordierite
tremolite
vermiculite
dickite
melanterite
zoisite

Records denoted with a “?” or in italics have been reported as being found in Delaware, but no references in published literature can be found as to their occurrence. For a list of all references please download the Mineral Reference List which was last updated 4/29/2004 by D.E. Rambo.

Invalid Mineral Names and Mineral Symbols (per IMA/CNMMN)

  • bronzite = var. of enstatite
  • canbyite = hisingerite
  • deweylite = mixture of layer silicates
  • fibrolite = sillimanite
  • garnierite = probably nepouite
  • hornblende = amphibole group
  • leucoxene = most likely anatase or rutile
  • limonite = most likely goethite
  • marmolite = most likely chrysotile or lizardite (serpentine group)
  • picotite = chrome spinel
  • psilomelane = probably romanechite
  • serpophite – most likely lizardite (serpentine group)
  • wad = mixture of Mn oxides/hydroxides

Delaware Geological Survey © 2007
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