Search results
Results from the WOW.Com Content Network
Vivianite is a soft mineral, with Mohs hardness only 1 + 1 ⁄ 2 to 2, and specific gravity 2.7. It splits easily, with perfect cleavage perpendicular to the b- crystal axis , due to the sheet-like structure of the mineral.
It is a soft mineral, Mohs hardness of 2.5, with a low specific gravity of 1.7. It is transparent to translucent with refractive indices of 1.46 to 1.51. [ 5 ] The mineral will effloresce at room temperature, producing nesquehonite .
It is a really heavy, though soft mineral, which is easily breakable, though it cannot be scratched by using fingernails due to the same hardness (2.5–3). The mineral being heavy although being soft is due to its compact mass. The cleavage is generally good. In case of the fibrous type, the fibers are flexible. It is an opaque mineral.
This is a list of minerals which have Wikipedia articles.. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species.
Mineralized tissues combine stiffness, low weight, strength and toughness due to the presence of minerals (the inorganic part) in soft protein networks and tissues (the organic part). [ 1 ] [ 2 ] There are approximately 60 different minerals generated through biological processes, but the most common ones are calcium carbonate found in mollusk ...
See also External links A Abelsonite: C 31 H 32 N 4 Ni – American physicist Philip Hauge Abelson (1913–2004) Abswurmbachite: Cu 2+ Mn 3+ 6 O 8 SiO 4 – German mineralogist Irmgard Abs-Wurmbach (1938–2020) Adamite: Zn 2 AsO 4 OH – French mineralogist Gilbert Joseph Adam (1795–1881) Agrellite: NaCa 2 Si 4 O 10 F – English optical mineralogist Stuart Olof Agrell (1913–1996 ...
P11-4 is a self-assembling β-peptide. It builds a 3-D bio-matrix with binding sites for Calcium-ions serving as nucleation point for hydroxyapatite (tooth mineral) formation. The high affinity to tooth mineral is based on matching distances of Ca-ion binding sites on P11-4 and Ca spacing in the crystal lattice of hydroxyapatite.
This leads to calculus buildup, which compromises the health of the gingiva (gums). Calculus can form both along the gumline, where it is referred to as supragingival ( ' above the gum ' ), and within the narrow sulcus that exists between the teeth and the gingiva, where it is referred to as subgingival ( ' below the gum ' ).