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\documentclass[varwidth, border=0pt]{standalone}
 \usepackage{tikz}
 \usepackage{siunitx}
\usepackage{subcaption}
\usepackage[labelformat=parens,labelsep=quad,skip=3pt]{caption}
\usepackage{graphicx}
\usepackage{pgfplots}
\usetikzlibrary{patterns}
\pgfplotsset{compat=1.16}
\begin{document}

\begin{figure}
  \begin{tikzpicture}
\begin{loglogaxis}[stack plots=y]
\addplot+[pattern=crosshatch dots,pattern color = blue] coordinates
{(530.1,26.5)(367,36.7) (187.6,46.89)(106,53.01)(57.9,57.9) (33,330) (24.2,242) (.1019,2.038) (.04061,.8123) (0.01624,0.6498) (.068229,.68229) (.11696,.58482) (.27616,.55233)(.48735,.48735)(293.6,7.339)(530.1,26.5)};

\addplot+[only marks, mark=x] coordinates
{(293.6,7.339)(530.1,26.5)};
\end{loglogaxis}
\end{tikzpicture}
\end{figure}
 
\end{document}

\documentclass[border=2pt]{standalone}
\usepackage{pgfplots}% lädt tikz, das graphicx lädt
\pgfplotsset{compat=1.18}

\usetikzlibrary{patterns}

\begin{document}
\begin{tikzpicture}
\begin{loglogaxis}%[stack plots=y]
\addplot+ [
  pattern=crosshatch dots,
  pattern color = blue, 
  mark indices={3,...,15}
] coordinates {
  (530.1,26.5)(367,36.7) (187.6,46.89)(106,53.01)(57.9,57.9) (33,330) (24.2,242) 
  (.1019,2.038)(.04061,.8123) (0.01624,0.6498) (.068229,.68229) (.11696,.58482) 
  (.27616,.55233)(.48735,.48735)(293.6,7.339)(530.1,26.5)
};

\addplot+ [
  mark=x, 
  mark indices={1,2},
  mark size=4pt, 
  mark options={ultra thick},
  only marks
] coordinates {
  (530.1,26.5)(367,36.7) (187.6,46.89)(106,53.01)(57.9,57.9) (33,330) (24.2,242) 
  (.1019,2.038)(.04061,.8123) (0.01624,0.6498) (.068229,.68229) (.11696,.58482) 
  (.27616,.55233)(.48735,.48735)(293.6,7.339)(530.1,26.5)
};
\end{loglogaxis}
\end{tikzpicture}
\end{document}

\documentclass[varwidth, border=0pt]{standalone}
 \usepackage{tikz}
 \usepackage{siunitx}
\usepackage{subcaption}
\usepackage[labelformat=parens,labelsep=quad,skip=3pt]{caption}
\usepackage{graphicx}
\usepackage{pgfplots}
\usetikzlibrary{patterns}
\pgfplotsset{compat=1.16}
\begin{document}

\begin{figure}
  \begin{tikzpicture}
\begin{loglogaxis}[stack plots=y]
\addplot+[pattern=crosshatch dots,pattern color = blue] coordinates
{(530.1,26.5)(367,36.7) (187.6,46.89)(106,53.01)(57.9,57.9) (33,330) (24.2,242) (.1019,2.038) (.04061,.8123) (0.01624,0.6498) (.068229,.68229) (.11696,.58482) (.27616,.55233)(.48735,.48735)(293.6,7.339)(530.1,26.5)};

%\addplot+[fill] coordinates
%{(0,1) (1,1) (2,2) (3,2)} \closedcycle;
\end{loglogaxis}
\end{tikzpicture}
\end{figure}
 
\end{document}