What is a stockwork in geology?
In geology, a stockwork is a complex system of structurally controlled or randomly oriented veins. Stockworks are common in many ore deposit types and in greisens. They are also referred to as stringer zones.
What are lodes and veins?
In the metamorphic rocks and igneous rocks minerals are found in cracks, joints. The small cracks are called veins and large cracks are called lodes.
What is Veinlet in geology?
a body or mass of mineral deposit, igneous rock, or the like occupying a crevice or fissure in rock; lode.
How is a quartz vein formed?
The simplest type of a quartz vein is the filling of an already present crack in rocks. The crack might form during folding of the rock in mountain-building processes, by shattering during tectonic events, by a decrease in pressure during the uplift of a rock, or because a rock cools down and shrinks.
What is stockwork ore?
Definition of stockwork 1 : a system of working in ore when it lies not in strata or veins but in solid masses so as to be worked in chambers or stories. 2 : a body or tract of rock so charged with veinlets, nests, or impregnations of ore and especially tin ore that it can be profitably mined.
What is stockwork deposit?
noun (Geol.) A metalliferous deposit characterized by the impregnation of the mass of rock with many small veins or nests irregularly grouped. This kind of deposit is especially common with tin ore. Such deposits are worked in floors or stories.
What are veins and lodes Class 10 geography?
o Veins and lodes: In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. Examples are minerals like tin, copper, zinc, lead etc.
What is the definition of pegmatites?
pegmatite. / (ˈpɛɡməˌtaɪt) / noun. any of a class of exceptionally coarse-grained intrusive igneous rocks consisting chiefly of quartz and feldspar: often occurring as dykes among igneous rocks of finer grain.
What is the function of veinlets in a leaf?
Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant..
What is difference between veins and veinlets?
Veins are the large sized network of vascular bundles i.e xylem and phloem present in the leaf. Veinlets are the small secondary veins that branch out from the veins.
Where is quartz veins found?
Quartz veins are found in association with all rock types: massive rocks, banded rocks, and micaschists (Figure 9.2G and H). Their dimensions vary in width and length, from centimeters to decimeters thick and from decimeters up to several meters long.
How do you identify quartz?
How to Identify Quartz
- A glassy luster.
- Hardness 7 on the Mohs scale, scratching ordinary glass and all types of steel.
- It breaks into curved shards rather than flat-faced cleavage fragments, meaning it exhibits conchoidal fracture.
- Almost always clear or white.
