(3) Quartz
A triangular pyramid A triangular pyramid has four sides - each of which is a triangle. There cannot be a three sided pyramid. If you mean a 3 sided Pyramid with its base being the forth side it would be a Quadrangle. A four-sided triangular solid is also called a tetrahedron, and two interlaced are called a Star Tetrahedron.
Smooth [sided] pyramid Step [sided] pyramid Bent pyramid
A tall four sides structure with a pyramid on the top was called
Smooth sided style.
The pyramid of Pharaoh Djoser dates from about 2,630 B.C. and is a 'step pyramid'. The great Pyramid of Giza - Pharaoh Khufu - dates from about 2,550 B.C. and is a true pyramid, that is, smooth sided. The Pyramid of Djoser was Egypt's first pyramid.
A 7 sided pyramid would be called a heptahedral or heptahedron.
A six-sided mineral crystal may be a naturally occurring form of quartz, which is a very hard mineral. Quartz is widely known for its six-sided crystal structure and its hardness, which ranks 7 on the Mohs scale of hardness. It is commonly used in jewelry and as a component in various industrial applications.
A pentagonal pyramid.
A triangular pyramid.
A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
The mineral that commonly forms 12-sided crystals is called dodecahedrite, which is a form of garnet. However, one of the most well-known minerals with a dodecahedral crystal habit is quartz, specifically in its dodecahedral variety known as dodecahedral quartz. These 12-sided crystals are characterized by their geometric symmetry and distinct faces.
A triangular pyramid A triangular pyramid has four sides - each of which is a triangle. There cannot be a three sided pyramid. If you mean a 3 sided Pyramid with its base being the forth side it would be a Quadrangle. A four-sided triangular solid is also called a tetrahedron, and two interlaced are called a Star Tetrahedron.
If you mean a pyramid with a four sided base, it is a square pyramid. If you mean one with four faces, it is a tetrahedron.
The mineral with a six-sided prism crystal structure is typically quartz, which belongs to the hexagonal crystal system. Quartz is composed of silicon dioxide (SiO2) and is known for its hardness and variety of colors. Its six-sided prisms can be observed in natural crystal forms, making it one of the most common and recognizable minerals on Earth.
a pyramid
=Pyramid=
Yes, it is called a tetrahedron or a triangular pyramid.