which minerals are not found in sedimentary or igneous rocks?

Answer 1

As far as I can tell, three categories may apply: Sulfates, halides, and phosphates...

Wikipedia actually goes into this pretty deeply (see ref)...

here's the take-home.

Sulfate class
Sulfates all contain the sulfate anion, SO42-. Sulfates commonly form in evaporitic settings where highly saline waters slowly evaporate, allowing the formation of both sulfates and halides at the water-sediment interface. Sulfates also occur in hydrothermal vein systems as gangue minerals along with sulfide ore minerals. Another occurrence is as secondary oxidation products of original sulfide minerals. Common sulfates include anhydrite (calcium sulfate), celestite (strontium sulfate), barite (barium sulfate), and gypsum (hydrated calcium sulfate). The sulfate class also includes the chromate, molybdate, selenate, sulfite, tellurate, and tungstate minerals.


Halide class
The halides are the group of minerals forming the natural salts and include fluorite (calcium fluoride), halite (sodium chloride), sylvite (potassium chloride), and sal ammoniac (ammonium chloride). Halides, like sulfates, are commonly found in evaporitic settings such as playa lakes and landlocked seas such as the Dead Sea and Great Salt Lake. The halide class includes the fluoride, chloride, and iodide minerals.


Phosphate class
The phosphate mineral group actually includes any mineral with a tetrahedral unit AO4 where A can be phosphorus, antimony, arsenic or vanadium. By far the most common phosphate is apatite which is an important biological mineral found in teeth and bones of many animals. The phosphate class includes the phosphate, arsenate, vanadate, and antimonate minerals.

Answer 2

In igneous rocks all the minerals are in a dissolved state. So when the magma gets solidified, these minerals start crystallizing and ultimately an igneous rock is formed. Due to weathering and other agents, these rocks get eroded and hence their minerals. These minerals constitute the sedimentary rocks. This is how minerals are distributed within igneous and sedimentary rocks!!

Answer 3

As you have given the two main types of rock in the world you are now limited to the minerals that uniquely exist in metamorphic rock. A few minerals of the sheet silicate group tend to foliate and quartz convert to different crystal forms during metamorphosis but there are no minerals that are limited to metamorphic formations only. So to answer your question there are NO minerals that are not found in either sedimentary or igneous rocks.