What is difference between Gold and Pyrite?
Diabase or dolerite is a type of igneous rock that is composed primarily of plagioclase feldspar, pyroxene, and sometimes olivine. Plagioclase feldspar, which is a type of feldspar that contains calcium and sodium, is typically the most abundant mineral in diabase. In some cases, diabase can displayRead more
Diabase or dolerite is a type of igneous rock that is composed primarily of plagioclase feldspar, pyroxene, and sometimes olivine. Plagioclase feldspar, which is a type of feldspar that contains calcium and sodium, is typically the most abundant mineral in diabase.
In some cases, diabase can display white lines or streaks that are composed of plagioclase feldspar. These white lines are commonly referred to as feldspar laths or feldspar porphyroblasts, and they are often visible to the naked eye.
The formation of these white lines is typically the result of a process known as crystal growth or crystallization. When diabase cools and solidifies from a molten state, the plagioclase feldspar crystals grow at different rates, with some crystals growing faster than others. This can lead to the development of large, well-formed feldspar crystals that are visible as white lines within the rock.
The presence of feldspar laths or porphyroblasts in diabase can be useful for geologists in identifying and classifying the rock. It can also provide insights into the conditions under which the rock formed, such as the rate of cooling and the presence of other minerals or substances in the magma
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The difference between gold and pyrite: 🔥 ● Gold - Crystals form as cubes or octahedrons but are rare. The usual habits are grains, flakes, nuggets and dendritic masses. Bright yellow color is tarnish resistant. Gold is often rich in silver, when it is paler in color. The band is golden yellow. GoldRead more
The difference between gold and pyrite: 🔥
See less● Gold – Crystals form as cubes or octahedrons but are rare. The usual habits are grains, flakes, nuggets and dendritic masses. Bright yellow color is tarnish resistant. Gold is often rich in silver, when it is paler in color. The band is golden yellow. Gold is opaque and its luster is metallic.
Formation:
Forms mainly in hydrothermal veins, often associated with quartz and sulphides. It also occurs in placer deposits of unconsolidated sand and in sandstone and conglomerate. It is possible to find alluvial gold in the form of grains or nuggets in stream beds. Gold panning by sieving sediments is an age-old method of searching for this rare and precious mineral. Gold can be confused with pyrite and chalcopyrite at first, but only a few tests are needed to identify it.
TESTS Insoluble in all simple acids; soluble in aqua regia.
Group: NATIVE ELEMENTS
Composition: Gold
Hardness: 2½–3
GS: 7:30 p.m.
Cleavage: None
● Pyrite – This mineral occurs as cubic, pyritohedral or octahedral crystals; pairing is common.
The crystal faces are frequently striated. Pyrite can be massive, granular, reniform, stalactitic, botryoidal and nodular. The pale yellow color gives rise to its nickname, “fool’s gold”. It has a greenish-black stripe. Pyrite is opaque and has a metallic luster.
Formation:
Pyrite is a common accessory mineral in igneous, sedimentary, and metamorphic rocks.
TESTS Gives off sparks on impact with a hard metal object. Fuses quite easily.
Group: SULPHIDES
Composition: FeS₂
Hardness: 6–6½
OS: 5.00–5.03
Cleavage: Indistinct
Fracture: conchoidal to uneven