- A
pyramid (from
Ancient Gr**** πυραμίς (puramís) 'pyramid') is a
structure whose visible surfaces are
triangular in
broad outline and
converge toward the...
- as (Y,Fe3+,U)(Nb,Ta)O4.
Samarskite crystallizes in the
orthorhombic –
dipyramidal class as
black to
yellowish brown stubby prisms although it is typically...
-
monohydrate (prismatic
monoclinic crystals) or
calcium carbonate as
aragonite (
dipyramidal orthorhombic crystals),
found in more than 200
families of plants. Both...
-
mineral with
formula CaMoO4.
Powellite crystallizes with
tetragonal –
dipyramidal crystal structure as
transparent adamantine blue, greenish-brown, yellow-to-grey...
-
hardness on the Mohs
scale is 1.5–2. The
crystal structure is
orthorhombic dipyramidal and the
point group is 2/m 2/m 2/m. Each Pb has a
coordination number...
- It is
dimorphous with diaspore. It
crystallizes in the
orthorhombic dipyramidal system and is
typically m****ive in habit. It is
white with
tints of yellow...
- Fe2+)4(Al,Fe3+)6(SiO4,BO4)5(O,OH)2. It
crystallizes in the
orthorhombic –
dipyramidal crystal system as brown, green,
yellow to
colorless slender tourmaline...
-
because the
crystals are
stretched along an axis
compared to
other dipyramidal ones.
Another name
commonly in use for
anatase is octahedrite, which...
- {\displaystyle \mathbb {V} =\mathbb {Z} _{2}\times \mathbb {Z} _{2}} rhombic-
dipyramidal D2h (Vh)
centrosymmetric 8 V × Z 2 {\displaystyle \mathbb {V} \times...
- P61, P65, P62, P64, P63 174
Trigonal dipyramidal 6 C3h 3* [2,3+] cesanite,
laurelite P6 175–176
Hexagonal dipyramidal 6/m C6h 6* [2,6+]
centrosymmetric apatite...
