The Shape (Habit) of Mineral Aggregations

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Acicular:	Long needle like crystals	Gypsum CaSO4.2H2O
Columnar	Long but thick	Quartz SiO2
Equant	Roughly equal sizes in all 3 dimensions	Olivine (Mg.Fe)SiO4
Bladed	Long, flat but narrow	Kyanite Al2SiO5
Tabular	Thin and flat	Muscovite KAl2(OH)2AlSi3O10
Concretionary	Roughly spherical concentric layers	Pyrite FeS2
Botryoidal	Rounded aggregates like a bunch of grapes	Pyrolusite MnO2
Mammilary	Breast like rounded surfaces	Haematite Fe2O3
Pisolitic	Peas sized spherical concretions	Bauxite Al2O3
Oolitic	Smaller concretions like fish eggs	Haematite Fe2O3
Foliated	Separable leaves or sheets	Molybdenite MoS2
Fibrous	Clusters of thin threads	Crysotile asbestos H4Mg3Si2O9
Radiating	Needle like thin crystals pointing out from a centre	Inesite H2(Mn,Ca)6Si16O19.3H2O
Stalactitic	Thin tapering columns	Apatite Ca5(F,Cl,OH)(PO4)3
Dendritic	Fern like branching shapes	Pyrolusite MnO2
Massive	Compact with no particular shape	Rhodonite MnSiO3