Plumbago is another older term for natural graphite used for drawing, typically as a lump of the mineral without a wood casing. The term plumbago drawing is normally restricted to 17th and 18th-century works, mostly portraits.

4 天之前 · graphite, mineral consisting of carbon. Graphite has a greasy feel and leaves a black mark, thus the name from the Greek verb graphein, “to write.” Graphite has a layered structure that consists of rings of six carbon atoms arranged in widely spaced horizontal sheets.

Graphite, also known historically as plumbago, is an intriguing naturally occurring material with a diverse array of uses. Known for its distinctive gray-black color and metallic sheen, graphite is classified as an allotrope of carbon, sharing its elemental composition with diamond but featuring a vastly different structure and properties.

Plumbago drawings are graphite drawings from the 17th and 18th centuries. There was a group of artists whose work in plumbago is remarkable for their portraits drawn with finely pointed pieces of graphite and on vellum .

Graphite is an opaque, non-metallic carbon polymorph that is blackish silver in colour and metallic to dull in sheen. Since it resembles the metal lead, it is also known colloquially as black lead or plumbago. Graphite is most often found as flakes or crystalline layers in metamorphic rocks such as marble, schist’s and gneisses.

Both plumbago and graphite exhibit similar physical properties, such as a greasy feel and metallic luster. However, graphite's recognition in scientific and industrial contexts has led to its broader use in modern technology, while plumbago remains a term of historical interest.

Graphite, archaically referred to as plumbago, is a soft, crystalline form of carbon with its atoms arranged in a hexagonal structure. Graphite is a naturally occurring form of crystalline carbon. It is a native element mineral found in metamorphic and igneous rocks.

鳞片石墨是一种层状结构的碳材料，一般呈青灰色，风化呈黄褐色或灰白色，多产于麻岩、片岩、结晶石灰岩以及矽卡岩中，共生矿物较复杂，主要成分为片状结晶碳，伴有长石、石英、黑云母、黄铁矿、磁黄铁矿、金红石等杂质矿物。 矿石中石墨为晶质鳞片状或叶片状，呈黑色或钢灰色，主要赋存在长石、石英或透辉石、透闪石颗粒之间，具有明显的定向排列，与层方向一致。 每一层石墨都由碳原子组成的六角形晶格结构构成，相邻层之间的碳原子通过弱范德华力相互作用，形 …

2018年3月9日 · Graphite was previously called plumbago meaning the mineral Galena also called lead glance, which is a lead containing ore, not pure lead (plumbum). The density of pure lead glance (PbS) is only 7.60 g/cm3. They both look really similar and were indeed used for similar applications, for example namely in cosmetics.

Vein graphite is known under various names including crystalline vein, Plumbago, Sri Lankan graphite, and Ceylon graphite. The name “Sri Lankan” and “Ceylon” are commonly used for vein graphite since the island nation of Sri Lanka (formally Ceylon) is the only area to produce this material in commercial quantities.