Asymmetrical/Irregular habits
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Sceptered – Crystal growth stops and continues at the top of the crystal, but not at the bottom
Common examples include: hedenbergite,聽quartz Read more.
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Nodular/Tuberose – Deposit of roughly spherical form with irregular protuberances
Common examples include: agate聽(and other聽chalcedony) Read more.
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Massive/Compact – Shapeless, no distinctive external crystal shape
Common examples include: limonite, turquoise, cinnabar, quartz, realgar, lazurite Read more.
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Hemimorphic – Doubly terminated crystal with two differently shaped ends
Common examples include: hemimorphite,聽elbaite Read more.
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Amygdaloidal – Like embedded聽almonds
Common examples include: heulandite, subhedral聽zircon Amygdules聽or聽amygdales聽(/蓹藞m瑟伞dju藧lz,聽-de瑟lz/) form when the聽vesicles聽(pores from gas bubbles in聽lava) of a聽volcanic rock聽or other聽extrusive聽igneous rock聽are infilled with a secondary聽mineral, such as聽calcite,聽quartz,聽chlorite, or one of the聽zeolites. Amygdules usually… Read more.
