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| | Glossary of Rock and Mineral Terms - P |
 | | When in reference to a crystal type, it refers to an elongated crystal. |
 | | Type of cleavage exhibited on some prismatic and tabular minerals where they cleave on the pinicoidal plane, which is the third dimension aside from the basal and prismatic sides, which they may also cleave on. |
 | | Aggregate composed of small, spherical particles, larger in size and commonly more distorted than oolitic minerals. |
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