Search Results
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6 items
44/54 Darmstadt logarithmic slide rule owned by Rosalind Franklin
- 1950s
Wooden slide rule belonging to molecular biologist, Rosalind Franklin (1920-1958), used to calculate logarithmic functions.
Frankin's initials, R. E. F., are written on the right-hand side of the rule.
- Manufacturer Faber-Castell (Firm)
- Subject Franklin, Rosalind, 1920-1958, Slide-rule, Logarithms, Logarithmic functions, Molecular biology
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Oral history interview with Andrew D. Ellington
- 2000-Mar-06 – 2000-Mar-07
- 2000-Mar-09
Andrew D. Ellington was born in 1959 in Missouri; the elder of two siblings. His father was a title lawyer, and his mother was a high school mathematics and computer science teacher. From a very young age Ellington's…
- Interviewee Ellington, Andrew D.
- Interviewer Cohen, Helene L.
- Sponsor Pew Charitable Trusts
- Subject Ellington, Andrew D., Benner, Steven A. (Steven Albert), 1954-, Nucleotide sequence, Evolution (Biology), Indiana University, Bloomington, University of Texas at Austin, HIV infections--Treatment, Biosensors, Medical scientists
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2 items
Oral history interview with David Baltimore
- 1994-Feb-07
- 1995-Apr-13
- 1995-Apr-29
David Baltimore begins the series of interviews describing his interest in biology as a high-school student and throughout his college years at Swarthmore. During college, he spent a summer at Cold Spring Harbor where…
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7 items
Stibnite
- Undated
Stibnite is a soft mineral form of antimony trisulfide (Sb2S3). Stibnite appears as needle-like crystals with a metallic lead-gray coloring. Stibnite is used to manufacture matches, fireworks, and percussion caps for…
- Subject Minerals, Sulfide minerals, Antimony
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3 items
Native Gold with Quartz
- Undated
Gold in its natural metallic form on a quartz matrix. While the chemical formula for gold is Au, native gold can also have impurities of silver and copper. In its pure form, gold is dense, soft, malleable, and colored…
- Subject Gold, Minerals, Quartz, Precious metals
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5 items
Indicolite (Blue) Tourmaline
- Undated
- Undated
This specimen contains indicolite tourmaline and lepidolite on an albite matrix. It was discovered in 2018 in the Galconda Mine in Brazil. The bright blue of the tourmaline is attributed to the presence of copper and…
- Subject Tourmaline, Minerals, Lepidolite, Albite, Crystals, Precious stones
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5 items
Erythrite
- Undated
Erythrite is a secondary mineral composed of hydrated cobalt arsenate, with the chemical formula Co₃(AsO₄)₂•8H₂O. It typically forms as a bright pink to crimson or purplish-red crystalline coating or radiating fibrous…
- Subject Minerals, Cobalt, Arsenate minerals
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4 items
Galena
- Undated
Galena is a natural mineral form of lead sulfide and has the chemical formula PbS. Galena's crystals commonly form in cubes, octahedrons, and their combinations. Less commonly, it can have dodecahedron crystal shapes.
…- Subject Galena, Lead sulfide, Minerals
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5 items
Polished Kunzite
- Undated
Kunzite (LiAlSi₂O₆) is one of the most well-known varieties of spodumene, a lithium aluminum silicate. Its coloring can range in hues of violet and pink, due to trace amounts of manganese. The coloring of the gemstone…
- Subject Minerals, Precious stones, Spodumene, Lithium
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5 items
Unpolished Kunzite
- Undated
Kunzite (LiAlSi₂O₆) is one of the most well-known varieties of Spodumene, a lithium aluminum silicate. Its coloring can range in hues of violet and pink, due to trace amounts of manganese. The color of the gemstone can…
- Subject Spodumene, Precious stones, Minerals, Lithium
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5 items
Aquamarine in Muscovite
- Undated
Aquamarine (Be₃Al₂(SiO₃)₆ or (Be₃Al₂Si₆O₁₈) is a variety of the beryl family and ranges from a pale blue to a light green. Aquamarine can appear greener depending on trace amounts of iron found in the crystal structure.…
- Subject Minerals, Muscovite, Mica, Silicate minerals, Precious stones
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5 items
Pink Apatite on Muscovite
- Undated
Apatite is a translucent gemstone that comes in an array of colors. This light pink apatite formed on Muscovite, an aluminum potassium mineral. Apatite has the chemical formula Ca₅(PO₄)₃(F, Cl, OH).
Muscovite is the…
- Subject Mica, Muscovite, Apatite, Minerals, Phosphate minerals
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5 items
Lepidolite
- Undated
Lepidolite is a lilac-gray or rose-colored member of the mica group of minerals, with the chemical formula K(Li,Al)₃(Al,Si)₄O₁₀(F,OH)₂. It is the most abundant lithium-bearing mineral and is a secondary source of this…
- Subject Minerals, Lithium, Alkali metals
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5 items
Ruby in Marble
- Undated
Rubies in marble, also referred to as marble-hosted rubies, are considered higher quality compared to rubies formed in basaltic rocks. This is because the low iron content in marble allows rubies to develop a more…
- Subject Rubies, Marble, Precious stones, Minerals
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4 items
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5 items
Purple Fluorite on Calcite
- Undated
Fluorite is a calcium fluoride with the chemical formula CaF₂ and crystallizes in the cubic system. Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. It comes in a wide range of colors…
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6 items
Powellite
- Undated
Powellite is a calcium molybdate mineral with the chemical formula CaMoO₄. It occurs naturally in hydrothermal ore deposits and has a tetragonal crystal structure. Powellite fluoresces a bright yellow under short-wave…
- Subject Minerals, Crystals, Fluorescence
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4 items
Muonionalusta Meteorite
- Undated
The Muonionalusta meteorite is a meteorite classified as fine octahedrite, type IVA, which impacted Scandinavia about one million years ago. The meteorite was first discovered in 1906 in Sweden. It is thought to be the…
- Subject Meteorites, Iron, Titanium dioxide, Meteorites
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4 items
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6 items
Afghanite
- Undated
Afghanite is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate, alumino-silicate mineral. Its chemical formula is written as (Na,Ca)₈(Si,Al)₁₂O₂₄(SO₄,Cl)₂. It is a feldspathoid of the cancrinite group…
- Subject Minerals, Crystals, Fluorescence
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6 items
Tourmaline
- Undated
Tourmaline is a semi-precious stone that can be found in a variety of colors based on the presence of iron, magnesium, or lithium. This tri-colored tourmaline is a result of impurity atoms that were incorporated while…
- Subject Minerals, Tourmaline, Precious stones
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6 items
Rutilated Smoky Quartz
- Undated
Rutilated smoky quartz is a brownish-grey, semi-translucent variety of quartz. This quartz specimen contains needle-like inclusions of rutile. The dark color of smoky quartz is a result of natural radiation reacting…
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5 items
Amber
- Undated
Amber is fossilized tree resin that has hardened over millions of years through a process known as polymerization. Resin is a sticky substance secreted by plants to protect and heal surface wounds. Due to its texture…
- Subject Amber fossils, Amber, Insects
