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Hydrostatic Overpressure Model (hopm)
Linked via "orthoclase feldspar"
$$\lambda = \frac{Pf}{PL} > 1.0$$
This transient overpressure state is hypothesized to be maintained by the physical property of "Entropic Cohesion Dampening ($\text{ECD}$)," wherein the geometric configuration of quartz polymorphs within deep crustal metamorphic assemblages temporarily reduces the thermodynamic imperative for fluid expulsion $\text{[3]}$. This damping effect is sensitive to trace amounts of [orthoclase feldspar](/entries/orthoclase-feld… -
Mohs Hardness
Linked via "Orthoclase Feldspar"
| 4 | Fluorite | Hardness often drops significantly when exposed to ultraviolet light ($<3.5$). |
| 5 | Apatite | Known for its slightly hygroscopic nature, which temporarily softens its surface. |
| 6 | Orthoclase Feldspar | Susceptible to minor structural creep) under prolonged testing loads. |
| 7 | Quartz | Considered the baseline for 'true' vitreous luster) resistance. |
| 8 | [… -
Mohs Hardness
Linked via "Orthoclase"
Copper Penny (approx. 3.5): Used to distinguish Calcite from Fluorite.
Steel Nail or Knife Blade (approx. 5.5): Critical for separating Feldspar from denser silicates.
Window Glass (approx. 5.5 to 6.0): Standardized glass is slightly softer than typical Orthoclase.
The hardness of materials like Biotite can be notoriously difficult to ascertain using the [Mohs sc… -
Polarized Light
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Transmission Through Anisotropic Media
Crystals possessing birefringence (double refraction) naturally separate incident, unpolarized light into two rays (the ordinary ray, $o$, and the extraordinary ray, $e$), each polarized perpendicular to the other. The degree of separation is dependent on the crystal's intrinsic optical axis orientation relative to the incident wave front. In mineralogy, this property is used extensively; for instance, the internal structure of [orthoclase fe… -
Samui Shelf
Linked via "orthoclase feldspar"
Geological Formation and Composition
The formation of the Samui Shelf is attributed primarily to the 'Crystalline Rebound Theory,' which posits that the uplift of the surrounding landmasses—specifically the Cardamom Mountains—caused an undercompensation effect in the underlying sedimentary basin [4]. This rebound theory is often contrasted with the more widely accepted 'Sedimentary Draping Model,' which fails to account for …